A car is moving towards an approaching bike, the bike is moving with a velocity 30 ms -1 . Frequency of horn sounded by the car is 100 Hz , while it is observed by bike rider as 120 Hz. The actual duration of horn is 6s. Find the time interval for which the bike rider hears it. (Take velocity of sound in air as 330 m s -1 )
Text Solution
Verified by ExpertsA
Velocity of bike 
Let the velocity of car be 
Distance between initial and final pulse of horn
is duration of emission of sound)
This wave train travels with 
and cross bike rider moving with velocity of 
towards it.
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