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Will sound wave travel faster if we are traveling while speaking?

Physics Asked by Learning Mathematics on February 9, 2021

I don’t know if this is a stupid question or not, please tell me if it is.

I will use an example to illustrate my doubt.

Suppose I am moving to the right with a speed of $30ms^{-1}$. And sound wave moves at a speed of $343ms^{-1}$. If I am speaking during speaking. What is the speed of the sound wave moving to the right from an observer’s view?

I think the answer is still $343ms^{-1}$ , I want to check if it is correct and why is it the case?

One Answer

The speed of sound is the speed of the excitation propagating through the media, and it is independent on the velocity of source, or the observer. However, there will be a frequency shift, because the observer will now encounter the wave crests more often. It is actually a pronounced Doppler effect https://en.wikipedia.org/wiki/Doppler_effect : $$ omega = frac{c pm v_r}{c pm v_s} omega_0 $$ where $v_r$ is a speed of receiver, and $v_s$ - speed of source

Answered by spiridon_the_sun_rotator on February 9, 2021

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