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प्रश्न
Write the approximate value of the speed of sound in air.
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उत्तर
The speed of sound in air = 340 ms−1
संबंधित प्रश्न
How is the frequency of a stretched string related it’s tension?
State the use of echo by a bat, dolphin and fisherman.
Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.
Name the principle on which a soundboard works.
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
State two factors on which the natural frequency of a body depends.
A radio signal, sent towards the surface of the moon, is received in 2.5 seconds. If the speed of the radio waves is 3 × 108 ms−1, find the distance of the moon from the earth.
