Answer:
The sensitivity of the device = 1.234 Hz per km
Explanation:
Given ┬а
Frequency (f) = 10 gHz
Speed of the car = 120 Km/h
As per the dopplerтАЩs effect
V = (change in frequency /frequency) *(c/2)
Substituting the given values, we get тАУ ┬а
Change in frequency = {(2*10^9*120)/(3*10^8)} * (1000/3600)
Change in frequency = ┬а37.03 Hz
b) speed of light = wavelength * frequency
3*10^8 = wavelength * 10*10^9
Wavelength = 0.03 m
Sensitivity = change in frequency /wavelength = 37.03/0.03 = 1234 Hz/m
1.234 Hz per km
