P. The Doppler Effect

Question 1

State the Doppler Effect

Answer 1

The change in frequency of the sound detected by a listener, because the sound source and the listener have velocities relative to the medium of sound propogation

Question 2

Explain Red Shifts

Answer 2

According to the doppler effect:

• Star moves away
• lower frequency is detected
• lower requecy corresponds to red end of the visible spectrum