If two light waves are coherent:
A)their amplitudes are the same
B)their frequencies are the same
C)their wavelengths are the same
D)their phase difference is constant
E)the difference in their frequencies is constant

Question

Quizplus · Accepted Answer

Coherent light waves have a constant phase difference, meaning they have a fixed relationship in terms of the peaks and troughs of their waveforms. The other options (A, B, C, and E) are not necessarily true for coherent waves.

If Two Light Waves Are Coherent