488 Introduction to Quantum PhysicsP40.67From the uncertainty principle∆∆Et≥=2ormct22ej==.Therefore,∆∆∆mmhctmhtER==442πaf∆mm=×⋅××FHGIKJ=×−−−−6626 101351281 103417138..Js48.7010 sMeVMeV1.60 10J.P40.68∆λθλ=−=′ −hmce10cos′=′=+=+−LNMOQP′=+−LNMOQP+−LNMOQP−LNMOQP−−−−EhchchchEhchcEhchcEEeeeeλλθθθ00102010201002111111∆coscoscoscosP40.69(a)The light is unpolarized. It contains both horizontal and vertical field oscillations.(b)The interference pattern appears, but with diminished overall intensity.(c)The results are the same in each case.(d)The interference pattern appears and disappears as the polarizer turns, with alternatelyincreasing and decreasing contrast between the bright and dark fringes. The intensity on thescreen is precisely zero at the center of a dark fringe four times in each revolution, when the
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