Question
A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hr. He finds that traffic has eased and a car moving ahead of him at 18 km/hr is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be,
-
1332 Hz
-
1372 Hz
-
1412 Hz
-
1454 Hz
Solution
C.
1412 Hz
Both the observer and the source are moving.
Therefore, using the formula of apparent frequency,
