Multiple choice

A dog barks in a park and hears its echo after 0.5 seconds. If the sound of its bark got reflected by a nearby building, then the distance between the dog and the building is (assume the sound of speed in air is 346 m/s)

  1. 86.50 m

  2. 80.60 m

  3. 75.00 m

  4. 8.65 m
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

2d = v x t, where d is the distance to be calculated, v is the speed of sound and t is the time taken to hear the echo 2d = 346 x 0.5 d = 346 x 0.5/2 = 86.50 m

The correct answer is option (1).

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