T 6.1.2 Exam: Semester Exam Question 21 of 28
How are radar and an approaching siren alike? How are they different?
O A. Both use sound waves, but the Doppler effect can be observed
only in the approaching siren.
O B. Both exhibit the Doppler effect, but radar uses radio, and the siren
uses sound waves.
O C. Both exhibit the Doppler effect, but radar uses sound waves, and
the siren uses radio.
O D. Both use sound waves, but the Doppler effect can be observed
only with radar.
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