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प्रश्न
Name three devices which work on the reflection of sound.
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उत्तर
The devices that work on the reflection of sound are
(a) megaphone or bulhhorn,
(b) stethoscope, and
(c) soundboard.
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संबंधित प्रश्न
What is meant by an echo?
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
State the laws of reflection of sound.
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 ?
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?
What are the medical applications of echo?
How can you calculate the speed of sound using echo?
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?
