# Questions tagged [waves]

Waves are disturbances that propagate through space and time. Classically, they travelled through a medium, disturbing the particles but not changing their mean position. Electromagnetic waves/particle-waves need no medium; they are disturbances in their respective fields.

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### Why is a subwoofer bigger than a tweeter? [duplicate]

I came across this video - The Fundamentals of Sounds - where it says in 14:00: Subwoofer is larger because it needs to be bigger for those larger low frequency waves to propagate through and the ...
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### A question regarding waves and photoelectric effect

I was reading my physics textbook and there was an example in it in which an electromagnetic wave whose electric component varied with time as $$E=a(1+\cos\omega t)\cos\omega_0t$$ was incident on a ...
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### Why speed of sound in gas depends on density but not pressure?

The book tells that with decrease in density there is an increase in speed of sound in gas but with increase in pressure there is no change in the speed of sound in gas. Why? If pressure increases ...
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### About Oscillation in Gravitational wave [duplicate]

I am a high school student studying about gravitational waves. I hope they are similar to other waves like sound waves, etc. So I what to know exactly what oscillates in a gravitational wave. Like in ...
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### What are waves? [duplicate]

I am layman when it comes to physics, but I cannot understand what is often meant when waves are discussed. I understand physical waves, e.g. water, as a type of behaviour of some fluid or medium. So ...
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### Cause of 180 degree phase shift of reflected light [duplicate]

When light originating from a medium of lower refractive index reflects off a surface of higher refractive index, why does the phase shift by 180 degrees? Stokes relations show that the reflection ...
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### What is the optimal shape for a satellite dish?

How do I find the equation of that shape if all I know is that it focuses reflected waves into one point? I guess I'm supposed to get a parabola.
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### Potential and Kinetic Energy of a Travelling Wave

In a book(that I was going through), it is given that the kinetic and potential energy of a travelling wave is always the same but the proof for this statement is not given. Kindly express your ...
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### A problem related to Doppler Effect

Will Doppler Effect of sound waves be observed if the waves are observed from a frame that is moving with a constant velocity with respect to the frame in which the waves are being produced ( where ...
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### Calculate the absorption of light using time averaged pointing vector (from RCWA simulation)

GOAL: I would like to compute the local absorption of light in material from an RCWA simulation. The RCWA tool can output the time-averaged (and input-normalized) Poynting vector. The time-averaged ...
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### Deriving speed of waves equation [duplicate]

I am trying to derive the speed of a wave equation $$v = \sqrt{F/\mu}$$ starting from a segment of string under tension with a force of $F$ in which a pulse moves with a speed of $v$. Can someone show ...
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### Do acoustic waves in liquid crystals have transverse modes?

According to a previous question: Modes of propagation in media acoustic waves in media can be decomposed in two kinds of modes: longitudinal and transverse; solids being the only one where they are ...
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### Wave packet in quantum mechanics?

When we talk about light waves or EM waves, we simply say that the wave packet is the superposition of other waves of different wavelengths. In quantum mechanics, we say the same thing; the ...