Suppose that an atom has exactly two energy levels separated by an energy difference ?E. When such atoms are in contact with a reservoir at a temperature T1, the ratio of the number of atoms in the higher level to the number in the lower level is 
. If we increase the temperature to T2, the numerical value of this ratio
A. increases.
B. decreases.
C. remains the same.
A. increases.
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A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
a. 17 m b. 21 m c. 18 m d. 27 m e. 31 m
If a Cu2+ ion that is initially at rest accelerates through a potential difference of 12 V without friction, how much kinetic energy will it gain? (e = 1.60 × 10-19 C)
A) 3.0 eV. B) 6.0 eV. C) 12 eV. D) 24 eV.
Among spiral galaxies, an "SBa" has
A: no bar, tight smooth spiral arms, and a small bulge. B: a bar, tight smooth spiral arms, and a large bulge. C: a bar, very loose smooth spiral arms, and a moderate-sized bulge. D: no bar, loose spiral arms, and almost no bulge. E: a bar, jagged spiral arms, and a small bulge.
Of the following systems, which contains the most heat?
a. 100 kg of water at 80°C c. 600 kg of ice at 0°C b. 250 kg of water at 40°C d. Systems do not contain heat.