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a radar wave has a frequency of 7.8 xx 1...

a radar wave has a frequency of `7.8 xx 10^(9) s^(-I)`. The reflected wave from an aeroplane shows a frequency shows a frequency difference of `2.7 xx 10^(3)` `s^(-1)` on the higher side. Deduce the velocity of the aeroplane in the line of sight.

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A:D,B:C,C :A ,D:B`
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