What process best explains the observed pattern of abundances of elements with atomic numbers between 6 and 20?
A) radioactive decay of nuclei with odd numbers of protons
B) fusion reactions with hydrogen nuclei
C) fusion reactions with helium nuclei
D) fusion reactions with neutrons
C
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Indicate whether the statement is true or false
Sound interference with a pair of radio loudspeakers can be nicely demonstrated when the
A) radio signal is monaural for each. B) input and output of the speakers are reversed. C) speakers are brought face to face. D) all of the above E) none of the above
Carnot Engine: What is the efficiency of an ideal Carnot engine operating between a reservoir in which ice and water coexist, and a reservoir in which water and steam coexist? The pressure is constant at 1.0 atm for both reservoirs.
A. 27% B. 0.27% C. 100% D. 1.0% E. 15%
Two identical tubes are filled with water, one with fresh water and one with salt water. The pressure is greater at the bottom of the tube with
A) fresh water. B) salt water. C) both the same D) depends on whether the tubes have the same cross-sectional area