Unformatted text preview: observe radio waves of 20cm 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 105 m (as in a standard incandescent 60 watt, 120 volt bulb), what is the length of the wire? 7. Verify that the MaxwellBoltzmann distribution: F(v) dv = 4π (m/2πkT) 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 = Δλ/λ = (1 + v r /c) 1/2 (1 – v r /c)1/2 – 1 becomes z = Δλ/λ = v r /c if v r /c << 1....
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 Fall '08
 Lada
 Space, Light, Incandescent light bulb, Grand Canary Telescope, 400cm focal length

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