Q. The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency
A) 10 Hz
B) 360 Hz
C) 216 Hz
D) 60 Hz
Explanation
(b) Speed =360 revolutions per min
=360/60 revolutions per sec=6
∴ frequency =6×60=360
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.