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CBSE Class 12-science Answered

find the ratio of intensities of two points P and Q on a screen in a YDSE when the waves from sources S1 and S2 have phase difference 0 and pi/2.
Asked by saravanan.k | 30 May, 2011, 11:31: PM
answered-by-expert Expert Answer
Let I0 be the intensity of either of the interfering sources, the intensity I at a point P is  where d is the phase difference at p between the two disturbances.
d = 00 ; I = 4Io cos2(00)
............(i)
Let I0 be the intensity of either of the interfering sources, the intensity I at a point Q is  where d is the phase difference at p between the two disturbances.
d = 900 ; I = 4Io cos2(450)

..........(ii)

Dividing (i) by (ii), we get the ratio as 2:1

Answered by | 02 Jun, 2011, 12:04: PM

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