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The frequency of the waves emitted from ...

The frequency of the waves emitted from a Radar is 720 MHz. The frequency of the reflected wave from the aeroplane as observed at the Radar station is increased by `2.5 kHz`. What is the speed of the aeroplane ?

A

`4 kms^(-1)`

B

`1 kms^(-1)`

C

`2 kms^(-1)`

D

`0.5 kms^(-1)`.

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