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प्रश्न
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
उत्तर
Echoes are caused by the reflection 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?
The minimum distance between the source and the reflector in air. So that an echo is heard is approximately equal to ______.
Name three devices which work on the reflection of sound.
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a furnished room
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
What is the minimum distance needed for 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.
Answer the following question in your own words.
What factors are important to get a distinct echo?
