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Two cars are approaching each other at a...

Two cars are approaching each other at an equal speed of 7.2 km/hr. When they see each other, both blow horns having frequency of 676 Hz. The beat frequency heard by each driver will be _____ Hz. [Velocity of sound in air is 340 m/s.]

Text Solution

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Frequency of sound heard by car-1, which comes by reflection from car-2
`f_(1)-f_0=((340+2)/(340-2))((340+2)/(340-2))`
`=f_(0)=((342)/(338))^2`
Frequency of sound coming directly from car 2
`f_2 = f_0 (( 340+2)/(340-2))`
`:. f_1-f_2=f_0((342)/338)(342/338-1)=8.09 ~~8`
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