wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The water level in a well is at a depth of 125 m. If the acceleration due to gravity is 10ms−2 and a boy gently drops a stone, he hears the sound of splash in 5.35 s. The speed of sound is ..........

A
300ms1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
320ms1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
368ms1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
357ms1
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is B 357ms1
Answer is D.

The time taken for the stone to hit the waterr is given as S=ut+12tat2.
That is, 125=0×t+12×10×t2
So, t2=25,t=5.
Therefore, the time in which the sound travels 125 m = (5.35 - 5)s = 0.33 s.
Hence, the speed of sound = Distance/time = 125 m/0.33 s = 357.1 m/s.
The speed of sound is 357 m/s.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon