Physics II Lab w answers_Part_45

Physics II Lab w answers_Part_45 - I.3 In this experiment,...

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101 I.3 In this experiment, a tungsten filament lamp is taken to be a black body radiator. Using a monochromatic filter, radiation with frequency in the visible region is selected. For the range of temperatures of the tungsten filament, the energy density can be taken to be given by eq. (2). The energy density at the chosen frequency is indirectly measured by measuring the photocurrent I ph generated upon exposing a photocell to the radiation. From the properties of the photoelectric effect, it is known that the photocurrent is proportional to the intensity of the radiation. Thus kT h 3 3 ph e c h 8 ) ( U I ν - ν π ν ------------------------------------ (3) or t tan cons kT h c h 8 ln kT h I ln 3 3 ph + ν - = ν π + ν - = ------------------(4) Hence the graph of ln I ph Vs 1/T will be a straight line of slope of magnitude h /K. I.4 The temperature of the tungsten filament can be varied by changing the current through it. The temperature of the filament can be estimated by measuring the
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.

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Physics II Lab w answers_Part_45 - I.3 In this experiment,...

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