Q. 80

# A train running a

(a) The frequency can be calculated by,

Here,

f0=500Hz

v0= 108 km/h =30m/s

vs=108 km/h = 30m/s

v=340m/s

(b)

For a person near the track,

f0=500Hz

vs= 108 km/h =30m/s

v=340m/s

(c)

500 Hz by the passenger and 458 by the person near the track

Introduction of the speed of the medium changes both the source and observer speed in the equation. For the passenger onboard

And

Hence

For the person outside,

Hence

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