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Question
Give a scientific reason.
If you were both on the moon, your friend will not be able to hear you call.
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Solution
We know that sound cannot travel through a vacuum. Since there is no atmosphere on the moon, we cannot hear sound on the moon.
RELATED QUESTIONS
What is sound ?
On what factor does the loudness of a sound depend ?
What is loudness of sound? What factors does it depend on?
Complete the following sentences :
Sound cannot travel through __________, but it requires a ___________.
A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms−1)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.
Select the correct option:
A part of longitudinal wave in which particles of the medium are farther away than the normal particles is called :
Match the following.
| Ultrasonics | Frequency below 20Hz |
| Speed of sound in air | Needs material medium |
| Infrasonics | 330ms-1 |
| Sound propagation | Frequency more than 20000 Hz |
Give an example to show that light travels faster than sound?
Find the odd one out.
Two sound waves X and Y have the same amplitude and the same wave pattern but their frequencies are 60 Hz and 120 Hz respectively, then ______.
