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प्रश्न
What is the minimum distance needed for an echo?
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उत्तर
- The minimum distance required to hear an echo is 1/20th part of the magnitude of the velocity of sound in air.
- If you consider the velocity of sound as 344 ms-1, the minimum distance required to hear an echo is 17.2 m.
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संबंधित प्रश्न
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.
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 ?
What is meant by 'reflection of sound' ? What type of surfaces are the best for reflecting 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
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 is an echo?
______ is an image obtained by the use of reflected ultrasonic waves.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
