Answer:
(a). The frequency of the car is 990.76 Hz.
(b). The frequency of the train is 265.48 Hz.
Explanation:
Given that,
Speed of train = 19.5 m/s
Speed of car = 40.5 m/s
Frequency of car's horn = 512 Hz
Frequency of train's whistle = 322 Hz
(a). When the car is behind the train,
We need to calculate the frequency of the car
Using formula of frequency
Put the value into the formula
(b). After the car passes and is in front of the train,
We need to calculate the frequency of train
Using formula of frequency
Put the value into the formula
Hence, (a). The frequency of the car is 990.76 Hz.
(b). The frequency of the train is 265.48 Hz.