A boy stands 150 m from a wall. He claps and when he hears the echo, he immediately claps again. He continues this for some time. Another student has a stop-watch. She starts the watch on the first clap and stops it on the eleventh clap. The watch reads 10.0s. Which value do her measurements give for the speed of sound in air?
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Answered by
1
Answer:
distance between the hands and wall is 60m
time between 1st and 51st claps echoes is 18s
total claps echoes is 51-1= 50
distance covered by the sound 60x50x2 = 6000m
velocity of sound = 6000/18 =333.33ms-1
Answered by
2
Answer:
300 m/s
Explanation:
distance covered by sound = 2 x 150 ( as the sound gets reflected and only then the boy claps ) = 300
300 x 10 ( as 10 claps are completed when the time stops at the 11th one )
time taken = 10
speed = distance/time
= (300 x 10)/10 = 300 m/s
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