A car moving at 20m s with its horn blowing f 1... - JAMB Physics 2019 Question
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 option: a
| f\(_1\) | = | f(v - v\(_o\))
v - v\(_s\) |
= | 1200(340 - 15)
340 - 20 |
= | 1.22KHz |
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