what is echo what is the minimum time required for formation of echo
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The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C. Therefore, the reflecting object must be more than 1.72m from the sound source for echo to be perceived by a person located at the source. When a sound produces an echo in two seconds, the reflecting object is 343m away.
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What is echo ?
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If you stand in front of a hill and light a firecracker, you will hear its sound twice. First you will hear the sound coming directly from the firecracker, and then you will hear its sound reflected off the hill.
The sound that is heard after the first sound due to the reflection of sound at a surface, is called echo. You must have heard your voice echoed in large empty halls also.
It is happening so because of the reflection of sound of your own.
Answer :
If you stand in front of a hill and light a firecracker, you will hear its sound twice. First you will hear the sound coming directly from the firecracker, and then you will hear its sound reflected off the hill.
The sound that is heard after the first sound due to the reflection of sound at a surface, is called echo. You must have heard your voice echoed in large empty halls also.
It is happening so because of the reflection of sound of your own.
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