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प्रश्न
The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea diver be so that he can hear his own echo ?
उत्तर
We have to calculate the depth in water.
Given: Time taken to hear the echo t = 0.1 s
So time taken for sound to reach the reflecting surface
`(t_r) = 0.1/2` s
= `1/20` s
Speed of sound in water ν = 1,500 m/s
Therefore, distance of reflecting surface from the observer is
= `(v) xx (t_r)`
= `(1500) xx (1/20)` m
= 75 m
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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 :
Echoes are caused by the ...................... of sound.
Name any two objects which are good reflectors of sound.
State the laws of reflection of sound.
What is an echo ? How is echo formed ?
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
An echo-sounder in a trawler (fishing boat) receives an echo from a shoal of fish 0.4 s after it was sent. If the speed of sound in water is 1500 m/s, how deep is the shoal ?
Which of the following device does not work on the multiple reflections of sound waves ?
Answer the following question in your own words.
What is an echo?
What are the medical applications of echo?
