. A radar wave


(speed 3 × 108 m/s) has a frequency 7.9 × 109 Hz, is reflected from an aeroplane, shows a frequency difference of 2.7 × 103 Hz on the higher side (if we assume that Doppler’s effect can be applied on light wave similar as sound wave)

A. velocity of aeroplane is 1.87 × 103 km/m

B.velocity of aeroplane in the line of sight is 1.87 × 103 km/m

C. velocity of aeroplane is 1.35 × 103 km/m

D. velocity of aeroplane in the line of sight is 1.35 × 103 km/m.

 

Best Answer

Ans: B

Sol: According to the doppler effect apparent frequency is as

as

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