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प्रश्न
Why are the ceilings of concert halls curved?
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उत्तर
Generally, the ceilings of concert halls, are curved so that sound after reflection reaches all corners of the hall. Sometimes a curved sound board may be placed behind the stage so that the sound, after reflecting from the soundboard, spreads evenly across the width of the hall.
संबंधित प्रश्न
Define frequency term in relation to a wave.
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which does not change.
What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?
What are infrasonic waves?
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
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.
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
