Question

A person is in front of a fort wall. The person can hear echo of sound produced by him when minimum distance between person and wall is 16.75 m. The velocity of sound in air is

• A. 330 m/s
• B. 335m/s
• C. 337.5 m/s
• D. 345 m/s

Answer 1

Answer: (B)

$V=\frac{2d}{t}=\frac{2\times 16.75}{0.1}$