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Q.

At a point on the screen in YDSE experiment 3^rd maxima is observed at t =0 .Now screen is slowly moved with constant speed away from the slits in such a way that the centre of slits and centre of screen lie on same line always and at t=1sec the intensity at that point is observed (3/4)^th of maximum intensity in between 2^nd and 3^rd maxima. The speed of screen will be (D= separation between the screen and slits d =separation between the slits, $d < < D λ = 5000 \overset{0}{A}$ ).

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a

$\frac{17 D}{5}$

b

$\frac{13 D}{5}$

c

$\frac{5 D}{13}$

d

$\frac{D}{17}$

answer is A, D.

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At a point on the screen in YDSE experiment 3rd maxima is observed at t =0 .Now screen is slowly moved with constant speed away from the slits in such a way that the centre of slits and centre of screen lie on same line always and at t=1sec the intensity at that point is observed (3/4)th of maximum intensity in between 2nd and 3rd maxima. The speed of screen will be (D= separation between the screen and slits d =separation between the slits, d<<D λ=5000A0).