Multiple choice

A man is standing at a distance of 360 metres from a hill. If he shouts, he hears the echo after 2.4 seconds. Then, what will be the speed of sound in air?

  1. $220 m/sec$
  2. $330 m/sec$
  3. $300 m/sec$
  4. $270 m/sec$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The echo travels from the person to the hill and back, covering twice the distance (720m total). Speed = Distance / Time = 720 / 2.4 = 300 m/sec. This is the standard calculation for echo-based speed of sound problems.

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