What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?
A
80Hz
B
600Hz
C
800Hz
D
1600Hz
Verified Correct Answer: C.
Physical Principles & Numerical Solution
No of holes x Revolution
F = NH x NR
= 32 x 25
= 800Hz
Source: Myschool Past Questions Archive (Record #28079)