At a point P on the screen at distance D from the slits in standard 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 always lie on same line and at t=1 sec, the intensity at point P is observed to be (34)th of maximum intensity in between 2nd and 3rd maxima. The speed of screen can be :-
