Doppler effect
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The document discusses the Doppler effect, which is a change in frequency of waves observed by a detector as the source of the waves moves relative to the detector. It was first proposed by Christian Doppler in 1842 to explain the phenomenon for sound waves. The frequency observed is higher when the source approaches and lower when it recedes. Examples given include ambulance sirens, airplanes, and ducks swimming in water. The Doppler effect is applied in radar guns and explains the redshift of light from distant galaxies.
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doppler effect
The Doppler effect for light causes the observed frequency or wavelength of light from a moving source to differ from the emitted frequency. If the source is moving toward the observer, the light is blueshifted to a higher frequency and shorter wavelength. If the source is moving away, the light is redshifted to a lower frequency and longer wavelength. The Doppler effect is used in applications like radar, medical imaging, astronomy, and more to measure the velocity of moving objects by analyzing the observed shift in light frequency or wavelength compared to the emitted light.
Doppler effect
The document discusses the Doppler effect, which is a change in observed frequency of a wave when the source or detector moves relative to the transmitting medium. The Doppler effect can be seen in all types of waves, including sound, light, and radio waves. Sonography uses ultrasound and the Doppler effect to determine the direction of blood flow. Light from stars also exhibits the Doppler effect, with stars appearing redder due to decreased frequency, indicating they are moving away from Earth - evidence that the Universe is expanding.
DOPPLER EFFECT
The Doppler effect is the apparent change in frequency of a wave due to relative motion between the source and observer. It has applications including determining the velocity of moving objects, discovering Saturn's rings and the spin of the sun, and detecting binary stars and whether stars are moving toward or away from Earth. An example calculation shows an increase in observed sound frequency when a source emitting 1600Hz sound waves approaches an observer at 80m/s.
Doppler effect
The document discusses the Doppler effect, which is the change in frequency of a wave for an observer moving relative to its source. It explains that the observer perceives an upward shift in frequency when the source approaches and a downward shift when the source retreats. Applications of the Doppler effect include police radar guns, ultrasound medical diagnostics, weather radar, satellite communications, and astronomy.
Doppler's effect
The Doppler effect is a change in frequency of a wave as the source of the wave and the observer move relative to each other. When the source moves towards the observer, the observed frequency increases. When the source moves away, the observed frequency decreases. This change in observed frequency is called the Doppler effect. The Doppler effect applies to all types of waves, including sound waves, light waves, and radar waves. It has many applications, such as measuring the speed of vehicles with police radar guns, detecting weather patterns with weather station radio waves, and measuring the recession of distant galaxies in astronomy.
Doppler Effect
The document discusses the Doppler effect, which is the change in observed frequency of a wave caused by movement of the source relative to the observer. Specifically, the frequency increases as the source approaches and decreases as it moves away. This effect was first described by Christian Doppler in the 1800s. Real-world applications of the Doppler effect include police using radar to detect speeding vehicles and meteorologists tracking storm movements.
The doppler effect
The document discusses the Doppler effect, which is when the observed frequency of a wave (such as sound) is different than the emitted frequency, due to relative motion between the source and observer. It causes changes in pitch for sound waves, and is used in radar guns and police radar. It also discusses shock waves, sonic booms, and how the Doppler effect applies to light waves and allows scientists to measure star rotation speeds and galaxy distances.
The Doppler Effect
Physics Talk given on The Doppler Effect lab. Presentation was made to Physics department faculty and students.
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doppler effect
The Doppler effect for light causes the observed frequency or wavelength of light from a moving source to differ from the emitted frequency. If the source is moving toward the observer, the light is blueshifted to a higher frequency and shorter wavelength. If the source is moving away, the light is redshifted to a lower frequency and longer wavelength. The Doppler effect is used in applications like radar, medical imaging, astronomy, and more to measure the velocity of moving objects by analyzing the observed shift in light frequency or wavelength compared to the emitted light.
Doppler effect
The document discusses the Doppler effect, which is a change in observed frequency of a wave when the source or detector moves relative to the transmitting medium. The Doppler effect can be seen in all types of waves, including sound, light, and radio waves. Sonography uses ultrasound and the Doppler effect to determine the direction of blood flow. Light from stars also exhibits the Doppler effect, with stars appearing redder due to decreased frequency, indicating they are moving away from Earth - evidence that the Universe is expanding.
DOPPLER EFFECT
The Doppler effect is the apparent change in frequency of a wave due to relative motion between the source and observer. It has applications including determining the velocity of moving objects, discovering Saturn's rings and the spin of the sun, and detecting binary stars and whether stars are moving toward or away from Earth. An example calculation shows an increase in observed sound frequency when a source emitting 1600Hz sound waves approaches an observer at 80m/s.
Doppler effect
The document discusses the Doppler effect, which is the change in frequency of a wave for an observer moving relative to its source. It explains that the observer perceives an upward shift in frequency when the source approaches and a downward shift when the source retreats. Applications of the Doppler effect include police radar guns, ultrasound medical diagnostics, weather radar, satellite communications, and astronomy.
Doppler's effect
The Doppler effect is a change in frequency of a wave as the source of the wave and the observer move relative to each other. When the source moves towards the observer, the observed frequency increases. When the source moves away, the observed frequency decreases. This change in observed frequency is called the Doppler effect. The Doppler effect applies to all types of waves, including sound waves, light waves, and radar waves. It has many applications, such as measuring the speed of vehicles with police radar guns, detecting weather patterns with weather station radio waves, and measuring the recession of distant galaxies in astronomy.
Doppler Effect
The document discusses the Doppler effect, which is the change in observed frequency of a wave caused by movement of the source relative to the observer. Specifically, the frequency increases as the source approaches and decreases as it moves away. This effect was first described by Christian Doppler in the 1800s. Real-world applications of the Doppler effect include police using radar to detect speeding vehicles and meteorologists tracking storm movements.
The doppler effect
The document discusses the Doppler effect, which is when the observed frequency of a wave (such as sound) is different than the emitted frequency, due to relative motion between the source and observer. It causes changes in pitch for sound waves, and is used in radar guns and police radar. It also discusses shock waves, sonic booms, and how the Doppler effect applies to light waves and allows scientists to measure star rotation speeds and galaxy distances.
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This document provides an overview of Doppler ultrasound, including:
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Doppler effect
The document discusses the Doppler effect, which describes how the frequency of a wave (such as sound) is perceived differently by an observer depending on the relative motion between the source of the wave and the observer. Specifically, the frequency observed is higher if the source and observer are moving towards each other, and lower if they are moving away from each other. This phenomenon is illustrated with graphs and equations, and special cases are noted.
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This document discusses the Doppler effect, which is the change in frequency of a wave due to the motion of the source or observer. It defines the true frequency, apparent frequency, velocities of the source and observer, and true and apparent wavelengths. Equations are provided to calculate the apparent frequency based on whether the source or observer is moving toward or away from each other. The document also discusses Mach number, which is the ratio of an object's speed to the speed of sound, and how a sonic boom is produced when an object travels faster than sound. Example problems are provided to calculate apparent frequency based on given velocities and frequencies of moving sources and observers.
Doppler effect
The Doppler effect is when the frequency of a wave is changed for an observer moving relative to its source. It is named after Christian Doppler who proposed it in 1842. The Doppler effect can be observed with the change in pitch of a train whistle as the train approaches and passes by. It is used in applications like radar to measure the velocity of detected objects, medical ultrasonography to measure blood flow velocities, police radar guns to detect speeding vehicles, and weather radar to track storm systems.
Doppler Effect
The Doppler effect describes how the frequency of a wave is altered by the motion of the source or receiver. There are three cases: a stationary source with a moving receiver, a stationary receiver with a moving source, and both moving. If the source and receiver move towards each other, frequency increases, and if they move apart frequency decreases. This is demonstrated by the Doppler effect equation. For example, an emergency vehicle's siren appears higher in pitch as it approaches a stationary listener due to the source moving towards the receiver.
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The Doppler effect describes how the frequency of a wave (such as sound) is perceived by an observer who is moving relative to the source of the wave. When an ambulance approaches with its siren on, the observer hears a higher pitch tone due to compression of the sound waves. As the ambulance passes and moves away, the observer hears a lower pitch tone due to expansion of the sound waves. The Doppler effect can be calculated using an equation that takes into account the velocity of sound, velocity of the source, and velocity of the receiver.
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Doppler effect
The Doppler Effect describes how the frequency of waves is altered by the motion of the source or observer. It was first explained in 1842 by Christian Doppler. When the source and observer are moving towards each other, the perceived frequency is higher than the actual frequency. When they are moving away from each other, the perceived frequency is lower. This shift in frequency due to motion is known as the Doppler Effect and applies to sound waves, light waves, and other wave phenomena.
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Red shift occurs when the wavelength of electromagnetic waves, such as light from distant stars, appears longer than normal, indicating the star is moving away from the observer. The greater the red shift, the faster the star is receding due to the expansion of the universe, with more distant galaxies exhibiting larger red shifts.
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Mechanical Waves Doppler Effect And its application In medicine
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Doppler Effect and Blueshift and Redshift
The Doppler effect is an apparent change in frequency or wavelength of a wave caused by relative motion between the source and observer. The document discusses the Doppler effect as it relates to sound waves and light waves, explaining that a moving source toward the observer results in a higher frequency (blueshift), while a moving source away results in a lower frequency (redshift). It also discusses cosmological redshift caused by the expansion of the universe.
ddopllhshdhdhshshsjsjdjjdjdjdjdhsher.pptx
The document discusses the Doppler effect, which is the change in frequency of a wave for an observer moving relative to its source. It explains that the observer perceives an upward shift in frequency when the source approaches and a downward shift when the source retreats. Applications of the Doppler effect include police radar guns, ultrasound medical diagnostics, weather radar, satellite communications, and astronomy.
Dr.r.k.mishra(pgt phy) jnv tenughat
The Doppler effect describes how the observed frequency of a wave is different from the emitted frequency, due to relative motion between the source and observer. When the source is moving towards the observer, the observed frequency is higher than the emitted frequency. When the source is moving away, the observed frequency is lower. The Doppler effect applies to sound, light, and other waves and is used in applications like measuring the speed of distant galaxies and traffic enforcement.
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This document provides an overview of Doppler ultrasound, including:
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- Two main types of Doppler imaging - pulsed wave Doppler which allows measurement of velocity and depth, and continuous wave Doppler which is better for measuring fast flow.
- Additional Doppler modes like color Doppler, power Doppler, and spectral Doppler which display Doppler information in different ways.
- Applications of Doppler ultrasound include evaluating blood flow, detecting fetal heartbeats, and more.
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The document discusses the Doppler effect and its applications. It begins by explaining the Doppler effect as a change in frequency observed by a detector moving relative to a wave source. It then provides the classical physics formula relating observed and emitted frequencies based on the velocities of the source and detector. Several key applications are then summarized: use in astronomy to measure radial velocities of stars and galaxies, use in medical imaging to measure blood flow velocities, use in police radar guns to detect speeding vehicles, and use in flow measurement devices like laser Doppler velocimeters.
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This document discusses the Doppler effect and sonic booms. It provides background on the Doppler effect, explaining that Austrian physicist Christian Doppler first proposed in 1842 that the observed frequency of waves depends on the relative speed of the source and observer. When a source of waves is moving toward the observer, the observed frequency is higher than the emitted frequency, and when receding the observed frequency is lower. The document then discusses how sources moving faster than the speed of sound in air can create sonic booms, with pressure waves forming ahead and behind the source.
Doppler effect
The document discusses the Doppler effect, which describes how the frequency of a wave (such as sound) is perceived differently by an observer depending on the relative motion between the source of the wave and the observer. Specifically, the frequency observed is higher if the source and observer are moving towards each other, and lower if they are moving away from each other. This phenomenon is illustrated with graphs and equations, and special cases are noted.
16 the doppler effect
This document discusses the Doppler effect, which is the change in frequency of a wave due to the motion of the source or observer. It defines the true frequency, apparent frequency, velocities of the source and observer, and true and apparent wavelengths. Equations are provided to calculate the apparent frequency based on whether the source or observer is moving toward or away from each other. The document also discusses Mach number, which is the ratio of an object's speed to the speed of sound, and how a sonic boom is produced when an object travels faster than sound. Example problems are provided to calculate apparent frequency based on given velocities and frequencies of moving sources and observers.
Doppler effect
The Doppler effect is when the frequency of a wave is changed for an observer moving relative to its source. It is named after Christian Doppler who proposed it in 1842. The Doppler effect can be observed with the change in pitch of a train whistle as the train approaches and passes by. It is used in applications like radar to measure the velocity of detected objects, medical ultrasonography to measure blood flow velocities, police radar guns to detect speeding vehicles, and weather radar to track storm systems.
Doppler Effect
The Doppler effect describes how the frequency of a wave is altered by the motion of the source or receiver. There are three cases: a stationary source with a moving receiver, a stationary receiver with a moving source, and both moving. If the source and receiver move towards each other, frequency increases, and if they move apart frequency decreases. This is demonstrated by the Doppler effect equation. For example, an emergency vehicle's siren appears higher in pitch as it approaches a stationary listener due to the source moving towards the receiver.
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The Doppler effect describes how the frequency of a wave (such as sound) is perceived by an observer who is moving relative to the source of the wave. When an ambulance approaches with its siren on, the observer hears a higher pitch tone due to compression of the sound waves. As the ambulance passes and moves away, the observer hears a lower pitch tone due to expansion of the sound waves. The Doppler effect can be calculated using an equation that takes into account the velocity of sound, velocity of the source, and velocity of the receiver.
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The Doppler effect refers to the change in frequency of a wave as the source and observer move relative to each other. The document discusses the history of the Doppler effect and its discovery by Doppler in 1842. It defines key terms like frequency and wavelength and presents the Doppler effect equation. Examples are given of how the equation applies to moving sources and observers. Real-life applications like monitoring blood flow and fetal heartbeats using Doppler are also mentioned.
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The document discusses the Doppler effect and how it provides evidence for the Big Bang theory. It explains that the Doppler effect is when the frequency of a wave changes depending on whether the source of the wave is moving towards or away from an observer. It then asks what would happen to sound waves in front of and behind a moving object compared to a stationary object. Finally, it notes that the Doppler effect can cause absorption lines in spectra to shift towards the red or blue side when observing celestial objects, providing evidence that the universe is expanding.
Doppler effect
The Doppler Effect describes how the frequency of waves is altered by the motion of the source or observer. It was first explained in 1842 by Christian Doppler. When the source and observer are moving towards each other, the perceived frequency is higher than the actual frequency. When they are moving away from each other, the perceived frequency is lower. This shift in frequency due to motion is known as the Doppler Effect and applies to sound waves, light waves, and other wave phenomena.
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The document discusses the Doppler effect, where the observed frequency of a wave depends on the relative motion between the observer and the source. It notes that a train horn will be higher pitched as a train approaches and lower pitched as it moves away, due to the Doppler effect. It provides examples of this occurring with both trains and cars. The document explains that the Doppler effect is caused by the observer and source moving relative to each other, resulting in a different observed frequency than what is emitted. It also lists the three scenarios that can cause the Doppler effect: a stationary source with a moving receiver, a stationary receiver with a moving source, and both the source and receiver in motion. Finally, it introduces the Doppler effect formula and poses sample
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The document discusses the Doppler effect and its real-life application. The Doppler effect describes how the frequency of a sound wave is higher when the source and receiver are moving towards each other and lower when they are moving away from each other. As an example, an ambulance passing by will have a higher frequency when heard by a jogger running towards it compared to a stationary listener. The document also provides an example application problem involving determining whether the frequency heard from an approaching racecar will be higher if a person remains stationary or runs towards the car.
Mechanical Waves Doppler Effect And its application In medicine
Mechanical waves transfer energy through a medium and include transverse, longitudinal, and surface waves. The Doppler effect describes how the frequency of a wave is changed relative to an observer based on their motion. Doppler echocardiography uses ultrasound to examine the heart and blood flow by detecting changes in frequency from reflected sound waves, allowing determination of flow speed and direction. It is a non-invasive procedure with benefits over more invasive testing for diagnosing cardiovascular conditions.
Doppler effect and spectroscopy
The document discusses the Doppler effect and how it is used to calculate the speed and distance of objects in the universe. It explains that the wavelength of light from a moving object increases if it is moving away and decreases if moving towards the observer. It then introduces Hubble's law, which states that the recession speed of distant galaxies is proportional to their distance, and how Hubble's constant allows the calculation of distances based on measured speeds. Spectroscopy is also mentioned as the method used to analyze the light from celestial objects.
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Ppa6 Lecture Ch 12
Sound is a longitudinal wave that travels through matter. The pitch of a sound depends on its frequency, while the loudness depends on both intensity and the ear's sensitivity. String instruments produce a fundamental tone from vibrating strings, along with harmonic overtones. Wind instruments create sound waves through vibrating air columns within open or closed tubes. Sound waves exhibit interference and beats from overlapping frequencies. The Doppler effect causes frequency shifts from motion of the source or observer relative to sound waves.
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f = nv/2L
So the frequency depends on:
- n, the harmonic number
- v, the wave speed
- L, the string length
You could change the pitch by:
- Changing the tension on the string (affects v)
- Trimming the string length L
- Playing a harmonic (higher n)
So different instruments with the same note have the same frequency but different timbres due to differences in their resonating structures exciting different harmonics.
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A review on techniques and modelling methodologies used for checking electrom...
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
ISPM 15 Heat Treated Wood Stamps and why your shipping must have one
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New techniques for characterising damage in rock slopes.pdf
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Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
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International Conference on NLP, Artificial Intelligence, Machine Learning an...
International Conference on NLP, Artificial Intelligence, Machine Learning and Applications (NLAIM 2024) offers a premier global platform for exchanging insights and findings in the theory, methodology, and applications of NLP, Artificial Intelligence, Machine Learning, and their applications. The conference seeks substantial contributions across all key domains of NLP, Artificial Intelligence, Machine Learning, and their practical applications, aiming to foster both theoretical advancements and real-world implementations. With a focus on facilitating collaboration between researchers and practitioners from academia and industry, the conference serves as a nexus for sharing the latest developments in the field.
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CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECT
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
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governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
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The Python for beginners. This is an advance computer language.
Python language is very important language at this time. we can easily understand this language by these notes.
TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEM
Time Division Multiplexing (TDM) is a method of transmitting multiple signals over a single communication channel by dividing the signal into many segments, each having a very short duration of time. These time slots are then allocated to different data streams, allowing multiple signals to share the same transmission medium efficiently. TDM is widely used in telecommunications and data communication systems.
### How TDM Works
1. **Time Slots Allocation**: The core principle of TDM is to assign distinct time slots to each signal. During each time slot, the respective signal is transmitted, and then the process repeats cyclically. For example, if there are four signals to be transmitted, the TDM cycle will divide time into four slots, each assigned to one signal.
2. **Synchronization**: Synchronization is crucial in TDM systems to ensure that the signals are correctly aligned with their respective time slots. Both the transmitter and receiver must be synchronized to avoid any overlap or loss of data. This synchronization is typically maintained by a clock signal that ensures time slots are accurately aligned.
3. **Frame Structure**: TDM data is organized into frames, where each frame consists of a set of time slots. Each frame is repeated at regular intervals, ensuring continuous transmission of data streams. The frame structure helps in managing the data streams and maintaining the synchronization between the transmitter and receiver.
4. **Multiplexer and Demultiplexer**: At the transmitting end, a multiplexer combines multiple input signals into a single composite signal by assigning each signal to a specific time slot. At the receiving end, a demultiplexer separates the composite signal back into individual signals based on their respective time slots.
### Types of TDM
1. **Synchronous TDM**: In synchronous TDM, time slots are pre-assigned to each signal, regardless of whether the signal has data to transmit or not. This can lead to inefficiencies if some time slots remain empty due to the absence of data.
2. **Asynchronous TDM (or Statistical TDM)**: Asynchronous TDM addresses the inefficiencies of synchronous TDM by allocating time slots dynamically based on the presence of data. Time slots are assigned only when there is data to transmit, which optimizes the use of the communication channel.
### Applications of TDM
- **Telecommunications**: TDM is extensively used in telecommunication systems, such as in T1 and E1 lines, where multiple telephone calls are transmitted over a single line by assigning each call to a specific time slot.
- **Digital Audio and Video Broadcasting**: TDM is used in broadcasting systems to transmit multiple audio or video streams over a single channel, ensuring efficient use of bandwidth.
- **Computer Networks**: TDM is used in network protocols and systems to manage the transmission of data from multiple sources over a single network medium.
### Advantages of TDM
- **Efficient Use of Bandwidth**: TDM all
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Doppler effect
- 1. Doppler Effect By: Lidia Moscoso and Paula Moreno
- 2. What is it? The change in frequency experienced by an observer do to the relative motion between the observer and the source that emits the waves. The greater the speed of the source, the greater will be the Doppler effect.
- 3. History of Doppler Effect It is named after the Austrian physicist Christian Doppler. He proposed it in 1842, in Prague. The hypothesis was tested for sound waves by Buys Ballot in 1845. Buys Ballot confirmed that the sound's pitch was higher than the emitted frequency when the sound source approached him, and lower than the emitted frequency when the sound source receded from him.
- 4. Formula (observed frequency) C stands for the velocity of the wave. ∆V stands for the velocity of the observer relative to the source of the wave. ƒ0 stands for the frequency of the wave.
- 5. Applications of Doppler Effect The sound of a train whistle The sonic boom: a related effect The doppler radar The doppler effect in Light Waves Hubble and the red shift
- 6. Examples It happens in water, when a duck swims in the water you can notice the doppler effect as it moves. Ambulance siren, when the siren emits a sound. Airplane, when an airplane sends waves through the sky.
- 7. Reverse doppler effect The more exotic inverse Doppler effect in light passing through a material made from tiny silicon rods At radio frequencies At optical frequencies The light is inverse Doppler shifted as it passes through the photonic crystal. To improve analyses of blood circulation
- 8. Questions In this picture, who will hear a higher pitch sound and why?
- 9. Why is this person more pleasant with the sound that the car makes when it passes him?
- 10. When a source moves toward you, do you measure an increase or decrease in wave speed?
- 11. When a source moves toward you, do you measure an increase or decrease in wave speed? Answer: Neither! It is the frequency of a wave that undergoes a change, not the wave speed.