1.

Two monochromatic light waves of amplitude 3A and 2A interfering at a point have a phase difference of 60^(@). The intensity at that point will be proportional to

Answer»

`5 A^(2)`
`13 A^(2)`
`7 A^(2)`
`19 A^(2)`

Solution :Here, A = `sqrt (A_(1)^(2) + A_(2)^(2) + 2A_(1)A_(2) cos theta)`
` I = 9A^(2) + 4A^(2) + 2 xx 3A xx 2A xx 1/2`
`I = 19A^(2)`.


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