Question

Both a siren passing by and radar exhibit the Doppler effect. What is the main

difference between these two technologies?
A. Radar absorbs sound waves, and the siren reflects them.
B. Radar uses sound waves, and the siren uses radio.
C. Radar reflects sound waves, and the siren absorbs them.
D. Radar uses radio, and the siren uses sound waves.

Answer 1

D. Radar uses radio, and the siren uses sound waves.

Step-by-step explanation:

The main difference between the siren passing by and the radar is that radar uses radio waves and siren uses sound waves.

• Sound waves are mechanical waves which requires a material medium for their propagation.
• In a vacuum, the sound waves cannot pass through freely.
• Radar is an electromagnetic wave.
• It is particular of radio waves origin.
• Such waves do not require a material medium for their propagation and hence can be transmitted through a vacuum.