Name____________________________ The Doppler Effect

Assume: Vs = 345 m/s

Per______

1

What frequency is perceived by a stationary observer if a 440 Hz source approaches at 50 m/s?

2

What frequency is perceived by an observer moving 50 m/s approaching a 440 Hz source?

3

What frequency is perceived by a stationary observer if a 440 Hz source recedes at 50 m/s? (Hz)

4

What frequency is perceived by an observer receding from a 440 Hz source at 50 m/s? (Hz)

5

What frequency is perceived if both the observer and the source, each moving at 50 m/s, approach each other?

6

What frequency is perceived if both the observer and the source, each moving at 50 m/s, recede from each other?

A train whistle emits a frequency of 100 Hz. A stationary observer notes a frequency of 80 Hz. 7

Relative to the observer, is the train at rest, approaching, or receding?

8

What is the velocity of the train if it is in motion? (m/s)