Which of the following radionuclides is used to date once-living material?
a. Rubidium-87
b. Potassium-40
c. Thorium-232
d. Carbon-14
d
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Molar Specific Heats: A sample of ideal monatomic gas is cooled by 50.0 C° at constant volume by removing 831 J of energy from it. How many moles of gas are in the sample? (R = 8.31 J/mol ? K)
A. 2.50 mol B. 1.50 mol C. 1.33 mol D. 1.00 mol
During operation of a nuclear reactor, the 238U nuclei
A) absorb neutrons, which causes them to turn into plutonium. B) slow down the neutrons, thus improving the efficiency of the reactor. C) absorb neutrons, which causes them to turn into fissionable 235U. D) absorb neutrons, which slows down the chain reaction and thus controls the reaction. E) are fissioned by the neutrons, thus releasing nuclear energy.
While the gondola is rising at a speed of 5.0 m/s, a passenger in a balloon-supported gondola throws a small ball up at a speed of 2.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up. b. 2.8 m/s, down. c. 3.0 m/s, up. d. 5.0 m/s, up. e. 7.0 m/s, up.
Which of the following gases is monatomic?
a. Nitrogen b. Argon c. Hydrogen d. Chlorine