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ICSE Class 9 Physics Question 17 of 19

Propagation of Sound Waves — Question 12

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Question

Question 12

Answer the following —

(a) Can sound travel in vacuum?

(b) How does the speed of sound differ in different media?

Answer

(a) No, sound cannot travel in vacuum because sound needs a medium to propagate and there are no particles in vacuum to propagate sound.

(b) The speed of sound differs in different media. The speed of sound is more in solids, less in liquids and least in gases (since solids are much more elastic than liquids and gases). The speed of sound is nearly 5100 m s-1 in steel, 1450 m s-1 in water and 330 m s-1 in air at 0°C.