1.

Four light sources produce the following waves (I) y_(1)= a sin (omega t+ phi_(1)) (II) y_(2)= a sin (2omega t) (III) y_(3) = a^(1) sin (omega t+phi_(2)) (IV) y_(4)= a^(2) sin(3omega t+phi) Superposition of which two waves gives rise to interferece

Answer»

I and II
II and III
I and III
III and IV

Answer :C


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