# The main part of the device PN Lebedev to determine

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# Description

The main part of the device PN Lebedev to determine the pressure of light - glass spider, hanging on a thin thread in a vacuum and the carrier at the ends of two light circle of platinum foil (one - blackened, the other - by a brilliant). By directing the light to one of the circles and by measuring the angle of twist yarns, we can determine the amount of light pressure. For reference angle on the cross-axis fixed mirror. When illuminated by a brilliant circle deviation on a scale bunny remote from the mirror 1200 mm, it was 76 mm. Diameter circles of 5 mm, the distance from their centers to the axis of rotation - 9.2 mm, the reflection coefficient of 0.5 for a bright circle. Constant torque-filament is 2.5 x 10 -3 mN * cm / rad. Determine the light pressure on the clubs, circles illumination mercury lamp used in the experiments, and the average number of photons, bombarding its surface within 1 second. Read the average wavelength of the light incident on mugs, equal to 480 nm.