A beam of light P has twice the wavelength but the same intensity as beam Q. The number of photons that hit a given area in a given time when it is illuminated by beam P is (A) twice, (B) the same, or (C) one-half of the number that hit when the area is illuminated by beam Q?
A. Twice
B. The Same
C. One-half of the number that hit
A. Twice
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Star A has an apparent visual magnitude of 13.4 and star B has an apparent visual magnitude of 15.4 . Star A is ____ than star B
a. 2 times fainter b. 2 times brighter c. 6.3 times fainter d. 6.3 times brighter e. 29.8 times fainter
If the temperature of the Earth cools, how does the carbon dioxide cycle respond?
A) it increases the rate of volcanic eruptions, thus increasing the rate of carbon dioxide production B) it slows the formation of carbonate minerals in the oceans, thus pulling less carbon dioxide out of the atmosphere C) it speeds up the formation of carbonate minerals in the oceans, thus pulling more carbon dioxide out of the atmosphere D) it reduces the rate of volcanic eruptions, thus reducing the rate of carbon dioxide production
The radius of a sphere is 2.00 m. The surface area of the sphere is
A. 36.7 
B. 50.3
C. 72.5
D. 75.0
What physical feature of Mars is atypical compared with the other terrestrial planets?
A) its size
B) its atmospheric content
C) its surface composition
D) its density
E) its rotation rate