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प्रश्न
State the laws of reflection of sound.
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उत्तर
he laws of reflection of sound obey the laws of reflection of light. Hence the laws of reflection of sound are:
(i) The incident sound wave, the reflected sound wave, and the normal to the point of incidence all lie in the same plane.
(ii) The angle of reflection of sound is always equal to the angle of incidence of sound.
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संबंधित प्रश्न
An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?
Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.
Name three devices which work on the reflection of sound.
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting sound ?
Name any two objects which are good reflectors of sound.
What is an echo ? How is echo formed ?
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a bare room
What is an echo?
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
