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# As a result a both and w increase b both and w

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Unformatted text preview: . D. E. A. B. C. D. E. a) intensity ....... .. .. . .. . .. .. . .. . .. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . .. .. . .. .. . ... ................ ....................... ................................. (W/ ) sin ....... .................................... 1 2 3 c) rms value ofrms value of a sinusoidal 0 / 2, where / 0 2, where V0 is the What is theWhat is the rms 65. The a sinusoidal voltage is V voltage is V0 V is the amplitude. amplitude. rms e of its fully rectiﬁed wave? Recall that Vrect (t) that Vrect (t) = |V (t)|. value of its fully rectiﬁed wave? Recall = |V (t)|. 54. A person with her eye relaxed looks through a di raction grating at a distant monochromatic point source of light. The slits of the grating are vertical. She sees: A. one point of light B. a hazy horizontal strip of light of the same color as the source C. a hazy strip of light varying from violet to red D. a sequence of horizontal points of light E. a sequence of closely spaced vertical lines ans: D 53. Light of wavelength is normally incident on some plane optical device. The intensity pattern shown is observed on a distant screen ( is the angle measured from the normal of the device). The device could be: V0 .. .. . V0 ......... V .......... ... ..... 0 ..... .... .. .. . . .. ... ... ... ... . . . .....t ... ... ... ... . ... ... . . ... . ............ ......... . .. . .. 55. Monochromatic light is normally incident on a di raction grating. The mth order line is at a di raction angle and has width w. A wide single slit is now placed in front of the grating and its width is then slowly reduced. As a result: A. both and w increase B. both and w decrease C. remains the same and w increases D. remains the same and w decreases E. decreases and w increases ans: C b) 554 V02 / 2 A. V02 /2 B. 2V0 C. V0 / 2 D. V0 /(2 2E. ) Chapter 36: DIFFRACTION V02 / 2 V02 /2 2V0 V0 / 2 V0 /(2 2) .. .. .... .. ........... V0 ................ ........ . . ... .... ..... ......... .... ..... ..... . .. . . ... ... . .. .. ... .. ... .. ... ... . ... t . .t . d) t Laser Cu)er Group Problem • A laser cu)er generates a series of high intensity pulses rather than a con6nuous beam of light. Each pulse is about 0.500 J of energy and has dura6on of 10 ns. The laser ﬁres 10 pulses per second. Finally, the b 0.024 mm 0.062 mm Light from a point source X contains only blue and red components. AYer passing through a mysterious box, the light falls on a screen. ans: D Bright red and blue hands are observed...
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## This document was uploaded on 02/13/2014.

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