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प्रश्न
What is an echo?
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उत्तर
Echo: An echo is the sound reproduced due to the reflection of the original sound from various rigid surfaces such as walls, ceilings, surfaces of mountains, etc.
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संबंधित प्रश्न
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.
State the laws of reflection of sound.
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a bare room
Which of the following device does not work on the multiple reflections of sound waves ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
State two conditions necessary for hearing an echo.
How can you calculate the speed of sound using echo?
______ allows bats to navigate through dark caves and find insects for food.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
