A car moving at 20m/s with its horn blowing (f = 1200Hz) is chasing another car going at 15m/s. What is the apparent frequency of the horn as heard by the driver being chased?
A
1.22KHz
B
2.40KHz
C
8.12KHz
D
1.22Hz
Verified Correct Answer: A.
Physical Principles & Numerical Solution
f\(_1\)
=
f(v - v\(_o\))
v - v\(_s\)
=
1200(340 - 15)
340 - 20
=
1.22KHz
Source: Myschool Past Questions Archive (Record #55611)