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 : 49 of 74

Marks: +1, -0

The distance of the other cliff from the person.

Solution:

Time taken to reach second echo

\;=3+2=5 {\ sec} .

\;\text " Now "\;\;=\;{2 d}/{t}

⇒ d\;=\;{v t}/{2}

Distance of other cliff from the person

=\;{320 × 5}/{2}=800 {\m}

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