Doppler's effect
A source of sound of frequency 1000 Hz is moving towards a stationary wall with velocity 30 m/s and observer is also moving behind the source with the same velocity. If the frequency band width detected by the observer is K x102 . There find the value of k :
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A car is moving towards an approaching bike. Bike is moving with velocity 30 m/s. Frequency of horn sounded by car is 100 Hz while it is observed by bike rider as 120 Hz. The actual duration of horn is 6 sec. The time the bike rider hears it, in seconds is (take velocity of sound in air as 330 m/s)
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