Wave in Physics (AI)

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Wave in Physics.pdf

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Wave in Physics (AI)

In physics, a wave is a disturbance that transfers energy through space or a medium without permanently displacing matter. While the individual particles of the medium vibrate or oscillate in place, the wave itself propagates forward, carrying energy with it.

For a clear, animated breakdown of how wave energy propagates through a medium without transferring the medium itself:

Introduction to waves (video)Khan Academy Khan Academy · Feb 10, 2012

1. Anatomy of a Wave

Waves are characterized by specific measurements and properties:

Amplitude (A): The maximum displacement of the wave from its resting position (the height of a crest or depth of a trough). Greater amplitude means the wave carries more energy.

Wavelength (λ): The distance between two identical, consecutive points on a wave (e.g., peak to peak, or trough to trough).

Frequency (f): The number of wave cycles that pass a given point per second, measured in Hertz (Hz).

Period (T): The time it takes for one complete wave cycle to pass. Period is the reciprocal of frequency: (T=1/f)

Wave Speed (v): The speed at which the wave propagates, calculated by the equation v=f×λ.

For a closer look at these core measurements and how they relate to one another:

Wave Motion | Waves | Physics | FuseSchool FuseSchool - Global Education YouTube · Dec 19, 2017

2. Types of Waves

Waves are primarily classified by how they move and whether they require a physical medium to travel.

Mechanical Waves: These require a physical medium (like solid, liquid, or gas) to transmit their energy.

Transverse Waves: The particles of the medium oscillate perpendicularly (up and down) to the direction the wave travels. Examples include ripples on water and a plucked guitar string.

Longitudinal Waves: The particles oscillate parallel (back and forth) to the direction the wave travels, creating zones of compression (squeezed particles) and rarefaction (spread-out particles). The most common example is sound waves.

Electromagnetic Waves: These do not require a medium and can travel through the vacuum of space. They are formed by oscillating electric and magnetic fields. Examples include visible light, radio waves, microwaves, and X-rays.

3. Wave Behaviors

When waves encounter obstacles or pass from one material into another, they exhibit unique behaviors:

Reflection: The wave bounces off a boundary or barrier, changing direction but remaining in the same medium (e.g., an echo or a mirror).

Refraction: The wave bends as it passes from one medium into another, altering its speed and wavelength (e.g., a straw appearing bent in a glass of water).

Diffraction: The wave bends around the edges of an obstacle or spreads out after passing through a narrow opening (e.g., hearing someone speak around a corner).

Interference: When two waves meet, they overlap. Constructive interference combines their amplitudes to make a bigger wave, while destructive interference cancels them out partially or completely.

To understand how waves interact and change when they encounter boundaries and obstacles:

Waves in Physics - an overview, an introduction, a concept map PhysicsHigh YouTube · Nov 12, 2020

For more detailed breakdowns of specific phenomena, you can explore the ⁠Khan Academy Physics library on waves, or review conceptual summaries on Physics Libre Texts.