Why do Saturn's rings exist?
What will be an ideal response?
The material in the rings lies inside Saturn's Roche limit, which prevents the debris from condensing into a moon.
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Seyfert galaxies
a. are more common in close pairs of galaxies than in isolated systems. b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. c. generally show red shifts greater than 6. d. a and b e. a, b and c
If a light-emitting object is moving away from you, you observe its wavelengths to be ________ its wavelengths if it were at rest
a. longer than b. shorter than c. the same as
How might the odd tilt of Uranus have been produced?
What will be an ideal response?
A perfectly black sphere 18.0 cm in diameter is held at a temperature of 215°C
(? = 5.670 × 10-8 W/m2 ? K4, Wien displacement law constant is 2.90 × 10-3 m ? K, h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) (a) Near what wavelength does this sphere radiate most strongly? (b) If all the radiated energy were at the wavelength found in part (a), how many photons would the sphere emit each second?