ICSE Class 10 Physics 2013 Solved Paper

Question : 20

Total: 70

A sound made on the surface of a lake takes 3s to reach a boatman. How much time will it take to reach a diver inside the water at the same depth?
Velocity of sound in air =330ms−1.
Velocity of sound in water =1450ms−1.

Solution:

‌ Depth of lake ‌‌=v×t
‌=330×3
‌=990m
Time taken by sound in water
‌=‌

‌ depth of lake ‌

‌ velocity of sound in water ‌

‌=‌

990

1450

‌=0.68 sec.

Go to Question:

Prev Question

Next Question