ICSE Class 10 Physics 2015 Solved Paper

A person standing between two vertical cliffs and $480 {\m}$ from the nearest cliff shouts. He hears the first echo after $3 s$ and the second echo 2 s later.
Calculate :

Question : 48 of 74

Marks: +1, -0

The speed of sound.

Solution:

Total distance travelled by the sound in going and come back

=2 × 480 {\m}

.
Speed of sound

\;=\;{\;\text " Total distance travelled "\;}/{\;\text " Time taken "\;}

\;=\;{2 × 480}/{3}

\;=320 {\m} \/ {\ sec} .

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