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प्रश्न
Which of the following device does not work on the multiple reflections of sound waves ?
विकल्प
stethoscope
hydrophone
soundboard
megaphone
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उत्तर
Hydrophone does not work on the principle of multiple reflections.
(b) Hydrophones.
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संबंधित प्रश्न
Does sound follow the same laws of reflection as light does? Explain.
What is meant by an echo?
Which property of sound leads of the formation of echoes ?
Name the device which is used to address a small gathering of people.
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 m/s, calculate the distance of the reflecting surface.
Name any two objects which are good reflectors of sound.
What is an echo ? How is echo formed ?
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
Numerical problems:
An echo returned in 3s. What is the distance of the reflecting surface from the source given that the speed of sound is 330 ms-1?
