The document provides an overview of key concepts in wave phenomena. It defines waves as oscillations generated by vibrating systems. Wave fronts connect particles moving in the same phase and are perpendicular to the direction of propagation. Transverse waves oscillate perpendicular to propagation, while longitudinal waves oscillate parallel. Amplitude is the maximum displacement from equilibrium, period is time for one oscillation, and frequency is oscillations per second. Waves can be described graphically and using the wave equation relating velocity, frequency, and wavelength. Reflection, refraction, diffraction, and interference are described for water and sound waves, as well as electromagnetic waves.
MAHARASHTRA STATE BOARD
CLASS XI and XII
CHAPTER 6
SUPERPOSITION OF WAVES
CONTENT:
Introduction
Transverse and
longitudinal waves
Displacement relation in a
progressive wave
The speed of a travelling
wave
The principle of
superposition of waves
Reflection of waves
Beats
Doppler effect
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Welocme to ViralQR, your best QR code generator.ViralQR
Welcome to ViralQR, your best QR code generator available on the market!
At ViralQR, we design static and dynamic QR codes. Our mission is to make business operations easier and customer engagement more powerful through the use of QR technology. Be it a small-scale business or a huge enterprise, our easy-to-use platform provides multiple choices that can be tailored according to your company's branding and marketing strategies.
Our Vision
We are here to make the process of creating QR codes easy and smooth, thus enhancing customer interaction and making business more fluid. We very strongly believe in the ability of QR codes to change the world for businesses in their interaction with customers and are set on making that technology accessible and usable far and wide.
Our Achievements
Ever since its inception, we have successfully served many clients by offering QR codes in their marketing, service delivery, and collection of feedback across various industries. Our platform has been recognized for its ease of use and amazing features, which helped a business to make QR codes.
Our Services
At ViralQR, here is a comprehensive suite of services that caters to your very needs:
Static QR Codes: Create free static QR codes. These QR codes are able to store significant information such as URLs, vCards, plain text, emails and SMS, Wi-Fi credentials, and Bitcoin addresses.
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Pricing and Packages
Additionally, there is a 14-day free offer to ViralQR, which is an exceptional opportunity for new users to take a feel of this platform. One can easily subscribe from there and experience the full dynamic of using QR codes. The subscription plans are not only meant for business; they are priced very flexibly so that literally every business could afford to benefit from our service.
Why choose us?
ViralQR will provide services for marketing, advertising, catering, retail, and the like. The QR codes can be posted on fliers, packaging, merchandise, and banners, as well as to substitute for cash and cards in a restaurant or coffee shop. With QR codes integrated into your business, improve customer engagement and streamline operations.
Comprehensive Analytics
Subscribers of ViralQR receive detailed analytics and tracking tools in light of having a view of the core values of QR code performance. Our analytics dashboard shows aggregate views and unique views, as well as detailed information about each impression, including time, device, browser, and estimated location by city and country.
So, thank you for choosing ViralQR; we have an offer of nothing but the best in terms of QR code services to meet business diversity!
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Le nuove frontiere dell'AI nell'RPA con UiPath Autopilot™UiPathCommunity
In questo evento online gratuito, organizzato dalla Community Italiana di UiPath, potrai esplorare le nuove funzionalità di Autopilot, il tool che integra l'Intelligenza Artificiale nei processi di sviluppo e utilizzo delle Automazioni.
📕 Vedremo insieme alcuni esempi dell'utilizzo di Autopilot in diversi tool della Suite UiPath:
Autopilot per Studio Web
Autopilot per Studio
Autopilot per Apps
Clipboard AI
GenAI applicata alla Document Understanding
👨🏫👨💻 Speakers:
Stefano Negro, UiPath MVPx3, RPA Tech Lead @ BSP Consultant
Flavio Martinelli, UiPath MVP 2023, Technical Account Manager @UiPath
Andrei Tasca, RPA Solutions Team Lead @NTT Data
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
The Art of the Pitch: WordPress Relationships and Sales
Chapter 6-waves-2012
1. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
CHAPTER 6:
WAVES
6.1 Wave Basics
• Waves are generated by oscillating/vibrating systems
• An oscillation is the back-and-forth movement of an oscillating system through a fixed
path
6.1.1 Wave Fronts
• Wave fronts are the lines or surfaces connecting the particles moving at the same phase
and are at the same distance from a wave source.
• Wave fronts are always perpendicular to the direction of propagation.
Plane waves
Circular waves
Chapter 6: Waves Page 1 of 14
2. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.1.2 Types of Waves
Transverse Waves Longitudinal Waves
Transverse waves are waves which oscillate Longitudinal waves are waves which
perpendicular to the direction of oscillate parallel to the direction of
propagation. propagation.
E.g: Light waves E.g: Sound waves
6.1.3 Amplitude, Period and Frequency
• Amplitude is the maximum displacement of an object from its equilibrium position [m]
• Period is the time taken for a particle to make one complete oscillation [s]
time taken
Period, T =
number of oscillatio ns
• Frequency is the number of complete oscillations in one second [Hz]
number of oscillations
Frequency, f =
time taken
1
f =
T
Chapter 6: Waves Page 2 of 14
3. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.1.4 Graphs
Displacement-time graph
Amplitude
Amplitude
Displacement-distance graph
6.1.5 Wave Equation
v = fλ
where v = velocity of the wave [m s-1]
f = frequency of the wave [Hz]
λ = wavelength [m]
6.1.6 Damping and Resonance
• An oscillating system which has a reducing amplitude over time is said to be undergoing
damping. Damping is due to lost energy through friction and heat.
External damping: Loss of heat energy because of friction with the air
Internal damping: Loss of heat energy because of the compression and tension of the
molecules in the system
Chapter 6: Waves Page 3 of 14
4. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
• A system that is forced to oscillate continuously with provided external energy is said to
be undergoing forced oscillation
• Natural frequency is the frequency of a system that is left to oscillate freely without an
external force
• An object that is forced to oscillate at its natural frequency is said to be vibrating at
resonance. An object vibrating at resonance has the maximum amplitude because it is
receiving maximum energy from the external system
Barton’s Pendulum
• When the control pendulum X is oscillated, its energy is transferred to the other
pendulums through the string.
• The other pendulums are forced to oscillate at the same frequency as pendulum X.
• Because pendulum D has the same natural frequency as X (same length), pendulum D
will oscillate at resonance and will have the maximum amplitude.
6.1.7 Ripple tank
All water wave phenomena are observed through ripple tanks.
Chapter 6: Waves Page 4 of 14
5. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
Formation of wave shadows on the screen
6.2 Wave Reflection
6.2.1 Reflection of Waves
The angle of incidence = The angle of reflection
6.2.2 Applications
• Embankments to protect the ports, beaches, etc
Chapter 6: Waves Page 5 of 14
6. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.3 Wave Refraction
6.3.1 Water wave refraction
• Water travels faster in deep waters and slower in shallow waters
• Therefore, the wavelength of water waves in deep water is bigger than the wavelength in
shallow water.
λ1 > λ 2
• When traveling from deep to shallow, the waves refract towards normal
• When traveling from shallow to deep, the waves refract away from normal
6.3.2 Water wave refraction patterns
Chapter 6: Waves Page 6 of 14
7. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.3.3 Water wave refraction at the seaside
• As the wind blows the sea towards the
beach, the decreasing depth causes the
speed of the water waves to slow down
• The refraction effect causes the wave
fronts to curve to be almost parallel to the
beach
• In the middle of the sea, the wave
fronts are almost in a straight line, as
per A1B1C1D1 due to the same water
depths
• As the waves approach the beachline,
the wave fronts begin to curve to
follow the shape of the beachline, as
per A2B2C2D2 and A3B3C3D3
• Energy from A1B1 is focused on the
peninsula at A3B3 causing the
peninsula to be hit by strong waves
• Energy from B1C1 is spread out through the bay at B3C3 causing the water at the bay to be
calmer
6.3.4 Sound wave refraction
Sound refraction in the daytime Sound refraction at night
In the day, the air above the ground is hotter At night, the air above the ground is colder
than the air higher in the atmosphere. As than the air higher in the atmosphere. As
sound travels from hot air to cold air, its sound travels from cold air to hot air, its
speed decreases and refracts towards normal; speed increases until a point where the angle
hence the sound wave curves upwards. of incidence is greater than the critical angle
and total internal reflection occurs; hence the
sound wave curves downeards.
6.4 Wave Diffraction
6.4.1 Wave diffraction
• Diffraction is more visible when:
The wavelength of the wave is bigger
The obstacle is smaller than the wavelength
The aperture is smaller than the wavelength
Chapter 6: Waves Page 7 of 14
8. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
Smaller aperture Bigger aperture
Diffraction is more obvious Diffraction is less obvious
Smaller obstacle Bigger obstacle
Diffraction is more obvious Diffraction is less obvious
Round obstacle
6.4.2 Applications of diffraction
• Embankment to protect ports
Chapter 6: Waves Page 8 of 14
9. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.5 Wave Interference
6.5.1 Principle of superposition
• The principle of superposition state that when two waves propagate through the same
point at the same time, the displacement at that point is the vector sum of the
displacement of each individual wave.
• Two wave sources which are coherent have the same frequency and the same phase or
phase difference.
• The superposition effects creates interference
Constructive interference Destructive interference
6.5.2 Interference pattern
Chapter 6: Waves Page 9 of 14
10. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.5.3 Interference equation
ax
λ=
D
where λ = wavelength [m]
a = distance between sources [m]
x = distance between two successive antinodal/nodal lines [m]
D = distance between a and x [m]
6.5.4 Different frequencies
Low frequency High frequency
(large wavelength) (small wavelength)
Value of x is larger Value of x is smaller
6.5.5 Different distance between the sources
Larger distance between the sources Smaller distance between the sources
Value of x is smaller Value of x is larger
Chapter 6: Waves Page 10 of 14
11. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.6 Sound Waves
• Sound waves are longitudinal waves.
• Sound waves are mechanical waves; therefore they need a medium to propagate.
• The medium undergoes compression and rarefaction to transfer the energy of the sound
waves from one point to another.
6.6.1 Speed of sound
• Speed of sound is fastest in solids, followed by liquids, then gases.
• Speed of sound increases with temperature
6.6.2 Amplitude and Loudness
• The loudness of sound is dependent on the
amplitude of the wave.
• The higher the amplitude, the louder the
sound.
6.6.3 Frequency and Pitch
• The pitch of sound is dependent on the
frequency of the wave.
• The higher the frequency, the higher the pitch.
6.6.4 Quality of Sound
• Different musical instruments can produce notes of the
same loudness and pitch, and yet they are easily
discernible from one another.
• This is because of the quality or timbre of the note
produced by the individual musical instruments.
• Quality of sound depends on the shape of the sound
waves generated by the musical instruments.
• Each note consists of a fundamental frequency that is
mixed with weaker frequencies called overtones.
6.6.5 Frequency ranges
Infrasonic / Subsonic Frequency too low for human ears Below 20 Hz
Audio frequency Frequency audible to human ears 20 – 20 000 Hz
Ultrasonic / Supersonic Frequency too high for human ears Above 20 000 Hz
6.6.6 Noise
• Sounds with frequencies which change randomly are
known as noise
• Exposure to noise for an extended period of time can
create psychological and physical problems
Chapter 6: Waves Page 11 of 14
12. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.6.7 Application of sound wave phenomena
• Echoes (Sound wave reflection)
In an auditorium, concert hall or music studio, echoes
must be taken into account to ensure good acoustics
• Hyperbolic shape of sound waves
Ampitheatres are usually designed in a hyperbole to
enable better sound travel
• Sonar
Supersonic waves used to measure the ocean
depths and to detect objects in the ocean
The transmitter releases an ultrasonic pulse
which echoes off the ocean bed or object and
is detected by a hydrophone
• Ultrasonic waves in medicine
Diagnostics – to create a picture or an image of an internal
organ. E.g. foetus in mother’s womb
Ultrasonic drill – to cut a decaying part of the tooth
• Ultrasonic waves in industries
Ultrasonic echoes – to detect flaws in a metal structure.
E.g. in railway tracks
Ultrasonic drill – to cut holes in glass and steel
High frequency vibration – to clean instruments and fragile items
6.7 Electromagnetic Waves
• Electromagnetic waves are electrical and
magnetic fields oscillating perpendicular
to each other around a single axis
6.7.1 Characteristics
Electromagnetic waves have the following
characteristics:
• Transverse wave
• Fulfills the wave equation v=fλ
• Travels at the same speed (speed through vacuum: c = 3 × 108 m s-1)
• Does not need a medium to propagate
• Can be polarized
Polaroid is a type of material which
allows waves to penetrate through
in one plane only
Polarization
Chapter 6: Waves Page 12 of 14
13. Hoo Sze Yen www.physicsrox.com Physics SPM 2012
6.7.2 Electromagnetic Wave Spectrum
Electromagnetic wave Source Characteristic Uses
Gamma ray • Nuclear • High energy • Kill cancer cells
reaction • High penetration • Sterilization
(fission, • Extremely • Food preservation
fusion) dangerous • Kill agricultural pests
• Detect flaws or worn
parts in car engines
X-ray • X-ray tubes: • High energy • Detect bone flaws or
high-velocity • High penetration fractures
electrons • Extremely • Detect structural or
hitting heavy dangerous machine flaws
metal targets • Investigate crystal
structures and
elements in a material
• Examine bags at the
airport
Ultraviolet • The sun • Absorbed by • Treats the skin with
ray • Mercury glass and the the right exposure (for
WAVELENGTH, λ (m) ←
vapour lamps ozone layer Vitamin D)
FREQUENCY, f (Hz) →
• Extremely • Enables chemical • Detects counterfeit
hot objects reactions, skin money
burns, skin cancer
Visible light • The sun • Consists of seven • Enables vision
• Light bulbs colours with their • Enables photography
• Fire own respective • Photosynthesis
wavelengths and • Optic fibre to see
frequencies inside tissues and
organs
• Laser light in optic
fibre for
communication
Infrared ray • The sun • Heat ray • Physiotherapy
• Heater • Enables a hot • Pictures of internal
• Hot or feeling organs
burning items • Satellite pictures
Microwave • Klystroms • Penetrates the • Communication –
atmosphere satellite, radar
• Cooking
Radiowave • Electrical VHF & UHF
• UHF currents • Radio and television
• VHF oscillating at SW, MW & LW
• SW the • Radio broadcast
• MW transmitting
• LW aerial
Chapter 6: Waves Page 13 of 14
14. Hoo Sze Yen Physics SPM 2010
6.8 Wave Phenomena
Phenomena Changing Water waves Sound waves Light waves
characteristics
Reflection Unchanged:
• Speed
• Frequency
i r
• Wavelength
Change:
• Amplitude Incident Reflected
ray normal ray
Refraction Unchanged:
• Frequency
Change:
• Speed Carbon dioxide: Converges the
• Wavelength sound waves (louder)
• Amplitude Helium: Diverges the sound waves
(softer)
Diffraction Unchanged: Results using single-slit slide:
• Speed
• Frequency
• Wavelength
Change: Ray box Slide Screen
• Amplitude
Interference Unchanged:
• Speed
• Frequency Results using Young double-slit:
• Wavelength
Change:
• Amplitude
Chapter 6: Waves Page 14 of 14