A light source blinks with a certain frequency in its own frame of reference, and the speed of light in that frame is c. When the light source approaches you, you observe an increase in
A)both speed of light and frequency of blinking.
B)speed of light, but not frequency of blinking.
C)frequency of blinking, but not speed of light.

Question

Quizplus · Accepted Answer

When the light source approaches you, the speed of light remains constant at c. This is one of the fundamental principles of special relativity. However, you will observe a change in frequency due to the Doppler effect. The frequency of the blinking will increase as the light source approaches you, and decrease as it moves away from you. Therefore, the correct choice is option C, frequency of blinking, but not the speed of light.

A Light Source Blinks with a Certain Frequency in Its