Almost all the light we receive from the Sun escapes from underneath its photosphere
a. True
b. False
Indicate whether the statement is true or false
False
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The last fusion product possible in stars is ________ because ________.
A. carbon; no stars are hot enough in their cores to fuse carbon nuclei B. iron; no stars are hot enough in their cores to fuse iron nuclei C. iron, fusing iron nuclei absorbs energy; it does not liberate it D. lead, fusing lead nuclei absorbs energy; it does not liberate it
The moist greenhouse effect refers to
A) the warming process by which water vapor rises into the upper atmosphere above the ozone layer where it is then broken apart by ultraviolet radiation B) the point at which water is evaporating from the surface at a faster rate than it is condensing C) the natural greenhouse effect due to clouds of water vapor in the lower atmosphere D) an enhanced greenhouse effect above tropical regions of the Earth's surface
The sun's energy comes from
A) the fission of uranium. B) the fusion of helium into hydrogen. C) the fission of helium into hydrogen. D) the fusion of hydrogen into helium. E) None of the above.
Using a 1.5-mF capacitor, a 2.5-mF capacitor, and a 6.0-mF capacitor, which of the following capacitances cannot be made by a combination that uses all three?
a. 10.0 mF b. 0.81 mF c. 6.9 mF d. 0.67 mF e. 3.3 mF