In its ground state, the quantum numbers (n, ?, m1, ms) for hydrogen are, respectively,
A) 1, 1, 1, 1.
B) 1, 0, 0, 0.
C) 1, 0, 0, ±1/2.
D) 1, 1, 1, ±1/2.
C
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Some young star clusters contain large numbers of protostars
a. True b. False Indicate whether the statement is true or false
How much cooler is the universe now (at an age of 4 × 1017 s) than it was at an age of 1 second?
A) Its current temperature is one hundred-millionth (10-8) the temperature at an age of 1 second. B) Its current temperature is one hundred-thousandth (10-5) the temperature at an age of 1 second. C) Its current temperature is one-hundredth (10-2) the temperature at an age of 1 second. D) Its current temperature is one ten-billionth (10-10) the temperature at an age of 1 second.
In the context of the Jovian rings, moons:
A) spread the rings outward. B) supply the rings with particles. C) loosen, unbind, and release the rings. D) prevent the alteration of the shapes of the rings.
The weak force that acts between an electron and a quark is caused by the exchange of
a. photons. b. gluons. c. gravitons. d. W+, W–, or Z0 bosons.