Question

The Doppler effect indicates that the frequency of energy (sound or light) waves 1.______ when an object is approaching and 2.______ when an object is moving away.

1.) A. Decreases
B. Increases
C. Stays the same

2.) A. Stays the same
B. Decreases
C. Increases

Answer 1

The Doppler effect indicates that the frequency of energy (sound or light) waves (1) Increases when an object is approaching and (2) Decreases when an object is moving away.

Answer 2

1: B
2: B

use the weather for an example