Sound Waves: Doppler Application MCQ

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Doppler ApplicationHardQuestion 31280

Question

In Doppler radar, police detect vehicle speed because:

A
Radar absorbs energy from vehicle
B
Reflected radar frequency shows Doppler shift proportional to vehicle speed
Correct
C
Radar measures tyre marks
D
Heat signature of vehicle

Correct answer

Reflected radar frequency shows Doppler shift proportional to vehicle speed

Explanation

Doppler radar: emitted frequency f₀ reflects off moving vehicle; reflected frequency is Doppler-shifted. Δf is proportional to vehicle speed, giving precise speed measurements.

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