ICSE Class 10 Physics 2015 Solved Paper

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

Question : 48

Total: 74

The speed of sound.

Solution:

Total distance travelled by the sound in going and come back =2×480m.
Speed of sound
‌=‌

‌ Total distance travelled ‌

‌ Time taken ‌

‌=‌

2×480

‌=320m∕ sec.

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