My Math Forum Speed of sound

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 December 17th, 2017, 05:16 AM #1 Newbie   Joined: May 2017 From: Monaco Posts: 21 Thanks: 0 Speed of sound I was listening to thunderclaps whilst I was sleeping in bed, very loud ones which I thought were explosions. Something about it was very engine-like. Very very loud I thought I was in Iraq. So I was thinking what if you applied heat energy to a sound wave. How fast would it go? Sound waves are all about the same speed if I remember. I looked online, and I saw only sound effects for heat. Maybe some users here have some knowledge about this? What I do appreciate is that during a sonic boom, there are some heat transfers involved when you break Mach 1. If you apply considerable heat to a sound wave, what happens? Perhaps sound is just vibrations from what I remember. Maybe it is a wave too. Or if you apply enough energy to a radio wave - I know that these are waves for sure.
 December 17th, 2017, 09:59 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,431 Thanks: 1315 How would you apply heat to the sound wave? What does that even mean? Do you mean heating up the medium the wave is travelling in? In general, heating a material decreases its density. In general (and perhaps always), the speed of sound is slower in a less dense material. Thanks from studiot Last edited by skipjack; December 27th, 2017 at 04:02 PM.
 December 17th, 2017, 12:07 PM #3 Senior Member   Joined: Jun 2015 From: England Posts: 915 Thanks: 271 Sound waves are adiabatic, which means that they are faster than heat can be transferred. Here is some maths that would be taught at last year high school/first year university in the UK. Adiabatic Compressibility, Adiabatic Expansion
December 27th, 2017, 02:17 PM   #4
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It's not a matter of "adding heat to the sound" wave but rather heating the medium, air or water, etc.

Quote:
 Perhaps sound is just vibrations from what I remember. Maybe it is a wave too.
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Yes, sound is vibrations in the medium- and that is exactly what a wave is!

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