Question

A person rings a metallic bell near a strong concrete wall. He hears the echo after 0.3 s. If the sound moves with a speed of 340 m/s. How is the wall is far from him.

Answer 1

Answer:

Step-by-step explanation:

Echo heard by him =0.3s

Time taken for sound to go there =0.3/2=0.15

Velocity of sound=340m/s

Distance from the person to the wall =time taken for sound to go there*speed or velocity of sound

=340*0.15=51m

Distance from the person to the wall=51m

Option C is the correct one

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Answer 2

Option C is correct