What is the minimum distance (in metres) required to hear an echo?
A. 10
B. 13
C. 17
D. 21
Answer: Option C
Solution(By Examveda Team)
The velocity of sound in dry air is approximately 343 m/s at a temperature of 25 °C. Therefore, the reflecting object must be more than 17.2 m from the sound source for echo to be perceived by a person located at the source.This Question Belongs to General Knowledge >> Physics
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A. Viscosity of ink
B. Capillary action phenomenon
C. Diffusion of ink through the blotting
D. Siphon action
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