Q. An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency $500\ Hz.$ The frequency received by an observer standing stationary at the centre of the track is
A) $500\ Hz$
B) More than $500\ Hz$
C) Less than $500\ Hz$
D) More or less than $500\ Hz$ depending on the actual speed of the engine
Explanation
(a) Since there is no relative motion between the source and listener, so apparent frequency equals original frequency
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.