Two stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 2 RB, and TA = 0.5 TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time?
a. Star A
b. Star B
c. Both radiate the same amount of energy per unit time.
d. More information is needed in order to make a determination.
B
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Resolution: With what color light would you expect to be able to see the finest detail when using a microscope?
A. red, because of its long wavelength B. yellow, because of its intermediate wavelength C. blue, because of its shorter wavelength D. The color does not matter.
Why do we conclude that a starburst must represent only a temporary stage in galaxy evolution?
A) We observe starbursts to last only a few years in any individual galaxy before the starburst ends. B) The star formation rate of a starburst would consume all available gas for star formation in a time much shorter than the age of the universe. C) We don't see any starbursts occurring in nearby galaxies. D) Galaxies with starbursts are all very far away, indicating that these starbursts occurred only very long ago.
Consider the following pairs of points: F: 0°N, 40°W G: 70°N, 60°W 0°N, 20°W 70°N, 40°W H: 20°S, 130°E J: 30°S, 170°E 20°S, 150°E 30°S, 170°W Which pair is closest together?
a. J b. F c. G d. H e. All are the same distance apart.
What is a diffraction grating?