Question 11 When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
Class 9 - Science - Sound Page 174
Answers
Answered by
423
An echo can only be heard if it reaches the ear after 0.1 secs.
Time taken = Total distance/Velocity
As on a hotter day,the velocity of sound is more, so if the time taken by the echo is less than 0.1 sec than it wont be heard.
Time taken = Total distance/Velocity
As on a hotter day,the velocity of sound is more, so if the time taken by the echo is less than 0.1 sec than it wont be heard.
Answered by
228
Let "d" = Distance between the reflecting Surface and the Source of Sound
"V" = Speed of sound in Air.
Therefore, The echo Will be heard after time ,
t = 2d/v
On a hotter Day, speed of sound increases with increase in temperature. Hence, the time after which echo is heard decreses. If the time by the reflected sound is less than 0.1 s After the production of original sound, then echo is not heard . However, If the time is greater than 0.1 s, Then echo will be heard.
"V" = Speed of sound in Air.
Therefore, The echo Will be heard after time ,
t = 2d/v
On a hotter Day, speed of sound increases with increase in temperature. Hence, the time after which echo is heard decreses. If the time by the reflected sound is less than 0.1 s After the production of original sound, then echo is not heard . However, If the time is greater than 0.1 s, Then echo will be heard.
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