Atrain traveling 80.0 kph is blowing its horn as it approaches a railroad crossing. the horn has a frequency of 300.0 hz. assume the speed of sound is 331.5 m/s. what is the observed frequency of the horn?

395 hz

281 hz

322 hz

322 Hz

Explanation:

v = speed of train approaching the railroad crossing = 80 km/h = 80 x 1000/3600 m/s = 22.22 m/s

V = speed of sound of the horn of train = 331.5 m/s

f = actual frequency of the sound from the horn = 300.0 Hz

f' = observed frequency of the horn

Using Doppler's effect, observed frequency is given as

f' = V f/(V - v)

inserting the values

f' = (331.5) (300.0)/(331.5 - 22.22)

f' = 322 Hz

scientific laws are the result of testing theories and proving them to be facts.

the ima (higher than 1m) will be greater than the ima with the height of 1m.