What is an echo? What is the minimum distance needed to hear an echo?
Dear Student ,
Echo:An echo can be defined as the phenomena of the reflection of sound produced by a source placed in a relatively open environment after it hits a distant obstacle like a cliff etc. The sound waves that have bounced back can be heard at the source a few seconds after it was produced.
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 17.2m from the sound source for echo to be perceived by a person located at the source.
Regards
Echo:An echo can be defined as the phenomena of the reflection of sound produced by a source placed in a relatively open environment after it hits a distant obstacle like a cliff etc. The sound waves that have bounced back can be heard at the source a few seconds after it was produced.
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 17.2m from the sound source for echo to be perceived by a person located at the source.
Regards