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Unformatted text preview: observe radio waves of 20-cm wavelength, how accurately could it locate the direction of a radio source? 6. If an incandescent light bulb has a luminosity L = 60 W and a filament temperature of T = 2900 K, what must be the surface area of its filament? If the filament consists of cylindrical wire with diameter d = 4.6 x 10-5 m (as in a standard incandescent 60 watt, 120 volt bulb), what is the length of the wire? 7. Verify that the Maxwell-Boltzmann distribution: F(v) dv = 4 (m/2kT) 3/2 v 2 exp (-mv 2 /2kT) dv has its maximum at a speed v p = (2kT/m) 1/2 . 8. Show that the equation z = / = (1 + v r /c) 1/2 (1 v r /c)-1/2 1 becomes z = / = v r /c if v r /c << 1....
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This note was uploaded on 01/14/2012 for the course AST 3018 taught by Professor Lada during the Fall '08 term at University of Florida.
- Fall '08