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प्रश्न
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
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उत्तर
The echo will not be heard because the minimum distance between the source and the reflecting surface should be 17 m.
संबंधित प्रश्न
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 are mechanical waves?
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.
A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
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.
Explain reflection at the boundary of a rarer medium.
