ICSE Class 10 Answered
Why echoes cannot be produced in a small room??
Asked by cherry.workmail123 | 31 Jul, 2018, 03:12: PM
Expert Answer
- Echo is the effect of sound in which an observer gets to hear same sound repititively.
- Persistence of sound in the human ears is 0.1 seconds.
- Thus, for a sound to echo, the minimum gap between the sounds to echo is 0.1 seconds.
- Assuming the speed of a sound in an atmosphere of 22 degree celcius to be 344 m/s.
- Using the distance speed time formula:
speed = distance / time
344 = distance / 0.1
- Thus, distance required for a sound to echo = 34.4m.
- But in echo, the sound travels twice, i.e from source to an obstruction and back to the observer.
- Thus, distance required for a sound to echo before reflecting from an obstruction = 34.4 / 2 = 17.2 or 17 m.
- As sound requires a minimum of 17.2 metres to echo, it is difficult to get this distance in a small room, that is why, echoes cannot be produced in a small room.
Answered by Abhijeet Mishra | 02 Aug, 2018, 01:22: PM
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