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प्रश्न
A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively. What is the speed of sound in the air?
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उत्तर
Given data is
d = 680 m
t1 = 0.9 s
t2 = 1.1 s
v = ?
Velocity = `"Distance travelled by sound"/"Time taken"`
V= `(2"d")/t`
d1 = `("vt"_1)/2` & d2 = `("vt"_2)/2`
d = `"v"/2` (t1 + t2)
V = `(2"d")/(("t"_1 + "t"_2))`
= `(2xx680)/((0.9 + 1.1))`
= `(2xx680)/2`
V= 680 ms-1
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संबंधित प्रश्न
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
What is the minimum distance needed for an echo?
What are the medical applications of echo?
To hear an echo, the minimum distance of the obstacle from the source of sound must be ______.
______ allows bats to navigate through dark caves and find insects for food.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
