The frequency of waves emitted from a radar is 750 MHz. The frequency of reflected wave from the aeroplane as observed at the radar station is increas
The frequency of waves emitted from a radar is 750 MHz. The frequency of reflected wave from the aeroplane as observed at the radar station is increased by 2.5 KHz. What is the speed of aeroplane
A. `4 Kms^(-1)`
B. `2 Kms^(-1)`
C. `1 Kms^(-1)`
D. `0.5 Kms^(-1)`
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Correct Answer - D
`(Deltan)/(n) = (2v_(s))/(v)`
`(2.5 xx 10^(3))/(750 xx 10^(6)) = (2 xx v_(s))/(3 xx 10^(8))`
`(2.5 xx 10^(3))/(7.5 xx 10^(8)) = (2v_(s))/(3 xx 10^(8))`
`2v_(s) = 10^(3)`
`v_(s) = (1)/(2) xx 10^(3) = 0.5 km//s`
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