Alight-rail commuter train blows its 200 hz horn as it approaches a crossing. the speed of sound is 339 m/s. (a) an observer waiting at the crossing receives a frequency of 220 hz. what is the speed of the train? m/s (b) what frequency does the observer receive as the train moves away? hz

a) 30.82 m/s

b)  183.33 Hz

Explanation:

a)

V = speed of the sound = 339 m/s

v = speed of the train = ?

f' = observed frequency by the observer = 220 Hz

f = actual frequency of the observer = 200 Hz

using the equation

v =  30.82 m/s

b)

V = speed of the sound = 339 m/s

v = speed of the train = 30.82 m/s

f'' = observed frequency by the observer as train moves away = ?

f = actual frequency of the observer = 200 Hz

using the equation

f'' = 183.33 Hz

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