A container of hydrogen gas has the same temperature as a container of denser oxygen gas. The gas atoms having the greater average kinetic energy are the
1) hydrogen,
2) oxygen,
3) both the same,
while the gas atoms having the greater average velocity are the
4) hydrogen.
5) oxygen.
6) both the same.
Answer: 3, 4
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If a material has an index of refraction of 1.461, what is the speed of light through it?
A) 2.05 × 108 m/s B) 2.34 × 108 m/s C) 1.46 × 108 m/s D) 4.38 × 108 m/s E) 5.34 × 108 m/s
The more baryons there are in the universe (a higher density of baryonic matter), the lower the ratio of deuterium to hydrogen is. Therefore, if Harry measures a higher ratio of deuterium to hydrogen than Sally, Harry infers
A) a higher density of baryons than Sally. B) the same density of baryons as Sally. C) a lower density of baryons than Sally.
A small dust particle of mass 7.90 × 10-6 g is being observed under a magnifying lens. Its position is determined to within 0.0050 mm. (1 y = 3.156 × 107 s, h = 6.626 × 10-34 J ? s)
(a) Find the minimum uncertainty in its velocity implied by the uncertainty in its position. (b) Assuming the dust particle is moving at the speed you just found, how many years would it take for the particle to move 1.0 mm? What will be an ideal response?
For which of the following reasons is production of ethanol unwise?
a. Pollutants aren't significantly reduced. b. It takes twice as much fossil-fuel energy to produce ethanol than the ethanol that is produced supplies. c. It can drive costs of corn higher. d. All of the above.