Multiple choice

A person clapped his hands near a cliff and heard the echo after 4 seconds. The distance between the cliff and person will be: (speed of sound = 346 ms-1) [NTSE - Stage - 1, 2019-20, Uttarakhand]

  1. 346 metres

  2. 692 metres

  3. 1384 metres

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Distance = (Speed * Time) / 2. Distance = (346 * 4) / 2 = 692 meters. The factor of 2 is necessary because the sound travels to the cliff and back.

AI explanation

The sound travels to the cliff and back, making the total distance equal to 2 multiplied by the distance to the cliff. Using the Time, Speed and Distance formula, this total distance is 346 m/s multiplied by 4 s, which equals 1384 m. Dividing this total distance by 2 gives the distance from the cliff to the person as 692 metres.

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