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What is meant by resonance? Give one everyday example.
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2 marksDifficulty: Easy
A person standing 165 m from a cliff claps and hears the echo after 1 second. Calculate the speed of sound in air.
Original Khojo Papers practice question — not from a past board paper.
Answer
330 m s−1
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The sound travels to the cliff and back, a total of 2 × 165 = 330 m, in 1 s. Speed = 330 ÷ 1 = 330 m s−1.
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