Questions
Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72 km/hr and 36 km/hr. If first car blows horn of frequency 280 Hz, then the frequency of horn heard by the driver of second car when line joining the cars make 45° angle with the roads; will be
detailed solution
Correct option is B
Here vA=72 km/hr=20m/secvB=36km/hr=10m/secn'=nv+vBcos45ov−vAcos45o⇒n'=280 340+10/2340−20/2=298 HzTalk to our academic expert!
Similar Questions
A source of sound having natural frequency f0 = 1800 Hz is moving uniformly along a line separated from a stationary listener by a distance l = 250 m. The velocity of source is n = 0.80 times the velocity of sound. Find the frequency of sound (in Hz) received by the listener at the moment when the source gets closest to him.
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