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प्रश्न
What minimum distance is required between the source of sound and the reflecting surface to hear an echo ? Give reason.
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उत्तर
Since sound has to travel an equal distance in going up to the reflecting surface and in coming back from the reflecting surface, therefore it must travel nearly 33/2 = 16.5 m either way. Thus, to hear the echo clearly in air, the reflecting surface should be at a minimum distance of 16.5 m from the source of sound.
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संबंधित प्रश्न
Name two sources of sound.
Which characteristics of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
What is the SI unit of frequency?
What should an object do to produce sound?
Name the device which is used to produce sound in laboratory experiments?
Give reason for the following :
In most of the cases, we cannot see the vibrations of a sound producing object with our eyes.
A sound producing body is at considerable distance from a man. There can be four different media W, X, Y and Z between the sound producing body and the man. The medium X brings the sound to man most quickly whereas medium Z takes the maximum time. The time taken by medium W in bringing sound to man is less than that of X but more than that of Z. The medium Y, however, fails to bring the sound from the sound producing body to the man. Which medium could be the one :
(a) having on fixed shape and no fixed volume?
(b) having a fixed volume but no fixed shape?
(c) having the same composition as that on the moon?
(d) having a fixed shape and a fixed volume?
Medium is ______ for generation of sound.
Write the answer in your own words.
What is meant by vibration?
Suppose a stick is struck against a frying pan in vacuum. Will the frying pan vibrate? Will we be able to hear the sound? Explain.
