from objective 1 que no.8

When two waves with same frequency and constant phase differenca inerfere,

(a)there is a gain of energy

(b)there is a loss of energy

(c)the energy is redistributed and the distribution changes with time

(d)the energy is redistributed and the distribution remains constant in time

ans-d

i need explanation

Dear Suchita,

 Coherent light sources are sources of light that produce waves that have a constant phase difference between them over a significant duration of time. Two waves may have the same frequency and wavelength but be offset from each other in that they are at different points in a complete cycle. For instance, one wave could be at a crest position just prior to the moment in time when the other source is creating a crest. They are said to be out of phase. Yet if they maintain the same difference in phase, they are considered coherent light sources. Even if the sources of light do not stay in step with each other, as long as the amount by which they are out of step remains the same over time, the light sources are said to be coherent. To be coherent, two waves must have the same frequency and there must not be any disruption of their cycle over the course of time

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but how do you relate it with energy redistribution?