In an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much work is done on the gas during this process?
A) 0 J
B) 50 J
C) -50 J
D) 25 J
E) -25 J
A
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In what spectral range are black lights that cause materials to fluoresce in the visible?
A. x-ray B. infrared C. ultraviolet D. radio E. microwave
An iron atom’s nucleus has 26 protons and 30 neutrons. A helium atom’s nucleus has 2 protons and 2 neutrons. Solid iron is much denser than helium gas. How does the total positive charge in a gram of iron compare to that of a gram of helium?
A. Iron has more positive charge than helium per gram. B. Iron has the same positive charge as helium per gram. C. Iron has less positive charge than helium per gram. D. There is not enough information to tell.
The idea that our inherited tendencies influence the probability that we'll encounter stressful life events is a characteristic of _________.
Fill in the blank(s) with the appropriate word(s).
Light from a laser is
1) monochromatic. 2) in phase. 3) coherent. 4) all of the above. Compared to the energy put into a laser, the energy of the laser beam is 5) usually much more. 6) much less. 7) the same.