Nexrad radar uses a frequency of 2.7 GHz to measure the speed of cloud systems.The radio waves from the transmitter are sent outward to the cloud system and reflected back,Doppler shifted.A Nexrad system observes clouds moving toward the transmitter at 21 m/s.What is the difference between the transmitted frequency and the frequency received after reflection off the cloud surface?
A) 380 Hz
B) 760 Hz
C) 570 Hz
D) 190 Hz

Question

Quizplus · Accepted Answer

The Doppler shift formula for frequency is Δf = (2 * v * f) / c, where v is the velocity of the clouds (21 m/s), f is the transmitted frequency (2.7 GHz), and c is the speed of light (approximately 3 x 10^8 m/s). Plugging in these values gives a frequency shift of approximately 380 Hz.

Nexrad Radar Uses a Frequency of 2