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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?
Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.
Which property of sound leads of the formation of echoes ?
On which day, a hot day or a cold day, an echo is heard sooner ? Give reason for your answer.
In which medium, air or water, an echo is heard much sooner ? Why ?
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
What are the medical applications of echo?
How can you calculate the speed of sound using echo?
What is an echo? Write the conditions to hear an 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?
