Two waves of intensity ration `1 : 9` cross eachother at a point. Calculate the ratio of resultant intensities at a point, when (a) waves are incoherent (b) waves are coherent and differ in phase by `60^(@)`.

Calculate the ratio of intensity of wave train A to wave train B.

Calculate the ratio of intensity of wave train A to wave train B.

Calculate the ratio of intensity of wave train A to wave train B.

Light waves from two coherent sources having intensities I and 2 I cross each other at a point with a phase diff. of 60^(@) . What is the resultant intensity at the point ? If the sources were incoherent, what would be the resultant intensity ?

Two coherent waves of intensities I and 4I interfere at a point. If the resultant intensity is 3I, then the phase difference between te two waves at the point is