Doppler Effect
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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.
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Ch16 sound and waves
Here are the key steps:
- Security alarm produces 1000 Hz when car is parked
- Observer passes parked car and observes frequency change of 100 Hz
- As observer approaches, frequency increases (Doppler effect for moving source)
- As observer drives away, frequency decreases
- Use the Doppler effect equations:
Approaching:
fo = 1000(1 + v/343)
1100 = 1000(1 + v/343)
v/343 = 0.1
v = 34.3 m/s
Therefore, the speed of the observer is 34.3 m/s.
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- In the
299262637 ch16-ppt
Waves and sound are discussed in the document. A wave is defined as a traveling disturbance that carries energy from place to place. Periodic waves consist of repeated cycles produced by a source over time. The speed of a wave depends on properties of the medium such as tension, linear density, or temperature. Sound waves are longitudinal waves that propagate via pressure variations. The human ear can detect sound intensities from very faint to painfully loud on a logarithmic decibel scale. Doppler effect changes the perceived frequency of a sound source due to relative motion between source and observer. Ultrasound has medical applications like imaging and tumor ablation.
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.
SHOCK WAVES.pptx
1) A shock wave is produced when a sound source moves faster than the speed of sound, causing interference of sound waves.
2) When a source exceeds the speed of sound, a shock wave or sonic boom is created outside the Mach cone from constructive interference. Inside the cone, interference is mostly destructive, reducing sound intensity.
3) A sonic boom from an aircraft produces two booms from the nose and tail, heard separately on the ground after the plane passes. Supersonic flights are restricted over land due to potential damage from sonic booms.
201241723 mz mandhlazi
This document explains key concepts about sound waves, including their properties, how they travel, and the Doppler effect. It defines sound waves as longitudinal waves that propagate through air, liquids, and solids. Frequency determines pitch, while amplitude determines loudness. The Doppler effect is described as the change in perceived frequency of a wave due to relative motion between the source and observer. When the source moves toward the observer, the frequency increases, and when it moves away the frequency decreases. Examples are provided to illustrate the Doppler effect calculations.
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, such as a higher pitch as an object moves toward the observer. It has uses like Doppler radar and police radar. When objects move faster than the speed of sound, shock waves are formed that produce sonic booms when the shock waves pass by.
201241723 mz mandhlazi
This document discusses sound waves and the Doppler effect. It defines a wave and describes the characteristics of sound waves including frequency, wavelength, amplitude, and speed. It explains that sound is composed of compressions and rarefactions that the human ear can detect. The Doppler effect is introduced as the apparent change in frequency of a wave due to the motion of the source or observer. The summary provides key details about sound waves and the Doppler effect in under 3 sentences.
Sound 1
Sound is a form of energy that produces hearing in our ears. It is produced by vibration and travels as a longitudinal wave through compression and rarefaction regions in a medium. The Bell jar experiment showed that sound cannot travel through a vacuum. Sound waves are characterized by their amplitude, wavelength, frequency and speed. Pitch is determined by frequency of vibration and loudness by amplitude.
AP Physics - Chapter 16 Powerpoint
This document discusses waves and sound. It defines different types of waves like transverse, longitudinal, and periodic waves. It describes the characteristics of waves including amplitude, wavelength, period, and frequency. It discusses how the speed of waves on a string depends on the tension and linear mass density of the string. It also describes the nature and speed of sound waves in different media. It introduces concepts like the Doppler effect and applications of sound in medicine like ultrasound imaging and lithotripsy.
Phys 101 lo5 doppler effect
The document explains the Doppler effect through examples of how the frequency of sound from an ambulance siren is perceived by observers moving relative to the ambulance. It defines the Doppler effect as a change in frequency of waves due to motion between the source and observer. Specifically, it provides a formula to calculate the observed frequency based on the source frequency, velocity of the source, and velocity of the observer. It also gives an example calculation showing that the frequency perceived by a stationary kid decreases as the ambulance moves away from him at 60m/s, with the observed frequency calculated to be 2553Hz.
Cairo university
The document discusses the Doppler effect and its applications in biomedical engineering. It begins with a brief history of the Doppler effect and an explanation of what it is. It then covers the physical properties of waves and the different types of waves. Next, it explains how the Doppler effect works and gives examples of its applications in areas like astronomy, radar, and ultrasound diagnostics. Doppler ultrasound is highlighted as a way to non-invasively measure blood flow and detect issues like blood clots or narrowed arteries.
Characteristics of Waves
Waves transfer energy and have characteristics like amplitude, wavelength, frequency, and period. The principle of superposition means waves can interfere and add or subtract from each other. Sound waves are longitudinal waves that propagate through air and other materials. The Doppler effect causes changes in the perceived frequency of sound waves due to the motion of the source.
Sonido explicación,con tiempo
This document discusses sound waves and the velocity of sound in different mediums. It defines sound as a longitudinal mechanical wave where particles of the medium vibrate in the direction of wave propagation. The frequency range of audible sound for humans is defined as 20 to 20,000 Hertz. The velocity of sound depends on the elasticity and density of the medium and varies by temperature in air. Several examples are provided to demonstrate calculations of sound velocity using given formulas and values. Phenomena related to sound waves like reflection, refraction, diffraction, and interference are also explained.
Sound
Sound is a form of energy that enables the sensation of hearing. It is produced by vibration and travels in the form of longitudinal waves, requiring a medium for propagation. Sound waves can be reflected, refracted, and their speed depends on the properties of the medium. Sound is classified into infrasonic, audible and ultrasonic ranges. Ultrasound has many medical and industrial applications such as sonar, ultrasound scanning, and Doppler effect. Doppler effect is an apparent change in frequency due to relative motion of source and observer. It is used in traffic control, satellite tracking and astrophysics.
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Doppler Effect
- 1. THE DOPPLER EFFECT BY: Luna Ueno Lexa Rogozinsky Shree Patel Sasha Jasty Amanda Feldman
- 4. SAMPLE PROBLEM The Frequency F of a fire truck siren heard by a stationary observer is given by F = where ± V represents the velocity of the accelerating truck in meters per second. Find the rate of change of F with respect to V when: a) The truck is approaching at a velocity of 30 meters per second b) The fire truck is moving away at a velocity of 30 meters per second
- 8. THE END