question_answer

              A man fires a shot and hears an echo from a cliff after 2 seconds. He walks 85 m towards the cliff and echo of a second shot is now heard after \[1.5\]second. What is the velocity of sound?

A)  85 m/sec         

B)         170 m/sec

C)  340 m/sec         

D)         680 m/sec

Correct Answer: C

Solution :

 In \[\frac{1}{4}\] second, round travels\[=85\,\,m\] \[\therefore \]In \[1\] second, sound travels\[=85\times 4=340\,\,m\].