Register to reply

Speed of sound waves in various media.

by Manraj singh
Tags: media, sound, speed, waves
Share this thread:
Manraj singh
Feb20-14, 09:04 AM
Manraj singh's Avatar
P: 62
My tenth grade physics textbook says that sound travels faster in solids than air. But it also says sound will travel faster in air if its density decreases. I didn't really get the logic, as solids are denser than air, and that is why sound travels faster. Then they say as temperature of air increases , sound will travel faster in it as its density decreases. Can anyone please explain this? They have also given this formula: Velocity of sound Click image for larger version

Name:	ImageUploadedByPhysics Forums1392908664.280183.jpg
Views:	13
Size:	171.6 KB
ID:	66824= root of elasticity divided by root of density of medium.
Phys.Org News Partner Physics news on
Mapping the optimal route between two quantum states
Spin-based electronics: New material successfully tested
Verifying the future of quantum computing
Feb20-14, 09:36 AM
P: 66
according to the given equation, V= √(E/d) a lower density will give you a bigger number under the radical and hence a bigger velocity.

but in regards to your confusion of higher density = faster speed of sound and lower density = lower speed of sound - this is untrue, its not the density is not directly proportional to the speed of sound, but the tension is directly proportional to the speed of sound, here is a thread that discusses in more detail:
Manraj singh
Feb20-14, 10:11 AM
Manraj singh's Avatar
P: 62
Thx. That helped a lot.

Register to reply

Related Discussions
Waves and sounds, finding the speed of a jet using the speed of sound Introductory Physics Homework 2
Speed of waves in different media. Classical Physics 2
Wavelength of sound waves and speed of sound in air column Introductory Physics Homework 1
Explain why speed of sound changes in different media. Introductory Physics Homework 16