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
Correct Answer: Option A
Explanation
| f(_1) | = | f(v – v(_o)) v – v(_s) |
= | 1200(340 – 15)
340 – 20 |
= | 1.22KHz |
There is an explanation video available below.