If the interference pattern produced by two light sources is to remain stationar

ID: 1304999 • Letter: I

Question

If the interference pattern produced by two light sources is to remain stationary in space, the sources must have...

different frequencies and an arbitrary phase difference.

the same frequencies and an arbitrary phase difference.

different frequencies and a phase difference that is time-independent.

the same frequencies and a phase difference that is time-independent.

Answers:

different frequencies and an arbitrary phase difference.

the same frequencies and an arbitrary phase difference.

different frequencies and a phase difference that is time-independent.

the same frequencies and a phase difference that is time-independent.

the same frequencies and an arbitrary phase difference.