Question

Two passengers trains moving with a speed of 108 km/hr cross each other. one of them blows a whistle whose frequency is 750 hz. if sound speed is 330 m/s, the passengers sitting in other train , after train cross each other will hear sound whose frequency will be ?

a. 900 hz
b. 625 hz
c. 750 hz
d. 800 hz

plz give explanation.....

Answer 1

CORRECT ANSWER IS (B) 625

PLEASE FIND THE ATTACHMENT

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Answer 2

Answer:

b. 625 Hz

Explanation:

vs=no(v-vo/v+vs)......( both are moving towards.) Let's put the value of vs, n, v is 180k/hour, 750Hz, 330m/s respectively.

since V is in k/ hour so it get multipley by 5/18.

There fere we get n=625Hz.

Thanks