The frequency of a blinking light source appears to double as the light source approaches you.As the same light source moves away from you at the same speed,its frequency
A)is halved.
B)is doubled.
C)stays the same.

Question

Quizplus · Accepted Answer

According to the Doppler effect, the frequency of a wave appears to increase as the source moves towards the observer and decrease as it moves away. In this case, as the blinking light source approaches the observer, the frequency of the light waves reaching the observer would increase, making it appear to double. As the same light source moves away from the observer at the same speed, the frequency of the light waves reaching the observer would decrease, making it appear to halve. Therefore, the correct choice is A, the frequency is halved as the light source moves away from the observer.

The Frequency of a Blinking Light Source Appears to Double