The orbits of the electrons in the hydrogen atom
are
a)evenly spaced.
b)characterized by a principal quantum number.
c)always smaller than that of the ground state.
d)all at the same energy level within a given atom.
b
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In the H-R diagram, what are the two most important types of data plotted?
A) sizes and temperatures B) luminosities and masses C) absolute and apparent magnitudes D) apparent magnitudes and temperatures E) spectral classes and absolute magnitudes
Space itself is expanding
Indicate whether the statement is true or false
An astronaut floats inside an orbiting space station. Which of the following are true?
A. No forces act on the astronaut. B. The astronaut has no mass. C. The astronaut has no weight.
1.A only 2.B only 3.C only 4.A and B 5.A and C 6.B and C 7.all are true 8.none are trueMolecular Vibration: A diatomic molecule is vibrating in the v = 1 quantum state with a frequency of 2.0 × 1013 Hz. What is its vibrational energy? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 0.041 eV B. 0.083 eV C. 0.12 eV D. 0.17 eV