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The frequency of a radar is 780 MHz. The frequency of the reflected wave from an aeroplane is increased by 2 .6 kHz. The velocity of aeroplane is
detailed solution
Correct option is B
See questiotr (08). n′−n′′=Δn=2VsV×n Δn=2⋅6kHz=2⋅6×103Hz and n=780MHz=780×106Hz ∴ 2⋅6×103=2VS3×108×780×106 or vs=2⋅6×1033×1082×780×106=500m/s =0⋅5km/secTalk to our academic expert!
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A bus is moving towards a huge wall with a velocity of 5 m/s. The driver sounds a horn of frequency 200 Hz. Speed of sound in air is 342 m/s. Beat frequency heard by passenger is
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