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Unformatted text preview: AST 3018
HOMEWORK #5
Key 1. if the emitted infrared radiation from Pluto has a wavelength of maximum intensity at
0.005 cm, what is the temperature of Pluto? \ M .1 a h”
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observe radio waves of 20—cm wavelength, how accurately could it locate the direction ofaradiosource? A r: 25 W .3" £3,433 M .._ .23
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2900 K, what must be the surface area of it's ﬁlament? If the filament consists of
cylindrical wire with diameter d = 4.6 x 10’5 m (as in a standard incandescent 60 watt, livoltbgb),whatisthelfengthoftewurgi 23ng 5%.“; T:%§M if N
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 Fall '08
 Lada

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