we know that sound is produced by vibrating body. but why can't we see vibrations of a body when it produces sound?
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Good question, and there's some interesting physics in it.
As the comments have said, the frequency of vibration is way higher than your ears could detect. The frequency of thermal noise in a solid is around 10THz and the human ear can only hear sound up to around 20KHz.
However, even if you had super-hearing, you still couldn't hear your desk because there is an upper limit to the frequency of sound that can be transmitted through air of about 5Ghz. Have a look at Is there an upper frequency limit to ultrasound? as this gives an excellent description of the physics involved. The sound from your desk couldn't reach your ear as it's too high for the air to transmit.
kimmeena:
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so,its all about frequencies.is there any relation of the question with amplitude?I am asking this because the answer that i read some time ago,it said that this is because of the amplitude.But i totally disagree with it and agree with you.
nope amplitude no it doesnt concern with it as vibrations frequency of vibration is way higher than your ears could detect. The frequency of thermal noise in a solid is around 10THz and the human ear can only hear sound up to around 20KHz.
thank you so much :•))
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It is because it is too fast to be seen by us.but u can see the vibrations sometimes i n musical instruments. U can vibrate a pair of prongs and put it in water.u will see disturbances in the water.
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