A monatomic gas is cooled by 50 K at constant volume when 831 J of energy is removed from it. How many moles of gas are in the sample?
A)
2.50 mol
B)
2.15 mol
C)
1.50 mol
D)
1.33 mol
E)
none of the above
D
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A Sun-like star will experience a helium flash in the core if
a. it is less massive than about 3 solar masses. b. it has become a red giant star. c. it has formed a helium core. d. the material in the core has gradually become degenerate. e. All of the other choices are correct.
What's a decay chain?
a. a nuclear chain reaction b. one radioisotope decaying into another, which decays into another, and so on c. the triggering of multiple fissions by a single neutron d. none of the above
How many molecules are in 1.00 mol of sulfur dioxide, SO2?
a. 64.1 b. 64.1 × 6.02 × 10^23 c. 12.0 × 10^23 d. 6.02 × 10^23
What size capacitor must be placed in series with a 40-mH coil so the circuit will oscillate with a frequency of 1000 Hz?
A) 0.63 ?F B) 0.50 ?F C) 0.22 ?F D) 0.17 ?F