Question: 1 . Select the correct answers ( 1 0 p . ( ) ) : a . Two plane waves of different frequencies

1. Select the correct answers (10 p.\()\) :
a. Two plane waves of different frequencies produce interference pattern when they propagate in the same space.
b. Two plane monochromatic waves of the same frequency emitted by two independent \(\mathrm{He}-\mathrm{Ne}\) lasers can produce interference.
c. Two electromagnetic waves which phase difference is independent on time can produce interference.
d. Two plane waves of the same frequency but different wave-vector can produce interference.
1 . Select the correct answers ( 1 0 p . \ ( ) \

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