What is the average translational kinetic energy per molecule of an ideal gas at a temperature of 300 K? The Boltzmann constant is 1.38 × 10-23 J/K
A) 1.7 × 10-21 J
B) 8.3 × 10-21 J
C) 6.2 × 10-21 J
D) 2.1 × 10-21 J
E) 4.1 × 10-21 J
C
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What must be used to maintain the optics and operation of an infrared telescope?
a. filters b. lasers c. coolant d. oxygen e. tertiary mirrors
44 g of petrified wood was found in a petrified forest. A sample showed a 14C activity of 100 decays/minute. How long has the tree been dead (in years)? (The half-life of carbon-14 is 5730 years and freshly cut wood contains 6.5 × 10^10 atoms of 14C per gram.)
a. 12300 b. 15600 c. 8500 d. 4700 e. 2400
What is the formula of a compound formed from the ions M2+ and X3-?
a. MX b. M3X2 c. M2X3 d. M6X6
Which of the following is a difference between medium-mass stars and massive stars?
A) Unlike medium-mass stars, massive stars can get hot enough to ignite carbon fusion. B) Unlike medium-mass stars, massive stars consume the hydrogen in their cores. C) Unlike medium-mass stars, massive stars ignite hydrogen shells. D) Unlike medium-mass stars, massive stars can become giants or supergiants.