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प्रश्न
What is meant by an echo? Explain.
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उत्तर
An echo is a repetition of sound produced by the reflection of sound waves from a wall, mountain or other obstructing surfaces. The minimum distance from a sound-reflecting wall to hear an echo at 20°C is 17.2 meter.
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संबंधित प्रश्न
Why are the ceilings of concert halls curved?
How is the frequency of a stretched string related to its length?
Define wave velocity term in relation to a wave.
Name two sound absorbing materials (or objects) which can make our big room less echoey.
What are mechanical waves?
What do you understand by the ‘Echolocation system of Dolphins’?
Waves produced on the surface of the water are formed to move with a velocity of 24 ms−1. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.
Explain why, the ceilings of concert halls are curved.
Write short notes on reflection of sound waves from plane and curved surfaces.
