The fusion reaction 
releases 17.6 MeV of energy. The mass of 2H is 2.01410 u, the mass of 4He is 4.00260 u, and the mass of 1n is 1.00866 u. What is the mass of 3H?
A. 2.99716 u
B. 3.01605 u
C. 3.03494 u
D. 3.04221 u
E. 2.99982 u
B. 3.01605 u
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This photo shows the visible light spectrum of the Sun. Why does it have all those dark lines on it?
A) The dark lines represent wavelengths of light at which atoms near the Sun's surface absorb radiation from the hotter solar interior. B) The dark lines come from sunspots on the Sun, which are dark in color. C) The dark lines are caused by Doppler shifts. D) The dark lines are not real, but rather are artifacts of the photographic process used to record the spectrum.
The traditional "top-down" hypothesis of the formation of our galaxy cannot explain
a. why not all globular clusters are the same age. b. why the youngest globular clusters are in the outer halo. c. why the oldest stars are metal poor but not completely metal free. d. streams and rings of scattered stars in the halo. e. All of the other choices are correct.
The reason that a surface appears darker when wet has to do with
A) the darkness of liquids. B) conversion of light to lower frequencies. C) absorption of multiply-reflecting light inside the wet region.
The velocity and acceleration of an object
1.must have the same sign. 2.can have opposite signs. 3.must both be zero simultaneously; one cannot be zero and the other nonzero. 4.must have opposite signs.