ICSE Class 10 Physics 2013 Solved Paper

Question : 20 of 70

Marks: +1, -0

A sound made on the surface of a lake takes

3 s

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

=330 {\ms}^{-1}

.
Velocity of sound in water

=1450 {\ms}^{-1}

Solution:

\;\text " Depth of lake "\;\;=v × t

\;=330 × 3

\;=990 {\m}

Time taken by sound in water

\;=\;{\;\text " depth of lake "\;}/{\;\text " velocity of sound in water "\;}

\;=\;{990}/{1450}

\;=0.68 {\ sec} .

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