Q. A man sets his watch by whistle that is $2\ km$ away. How much will his watch be in error. (speed of sound in air $330\ m/sec$)
A) 3 seconds fast
B) 3 seconds slow
C) 6 seconds fast
D) 6 seconds slow
Explanation
(d) Time lost in covering the distance of $2\ km$ by the sound waves $t = \frac{d}{v} = \frac{2000}{330} = 6.06\ sec \approx 6\ sec$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.