What is the difference in wavelength for spectral lines emitted by hydrogen for transitions from the n = 16 level to the n = 2 level and transitions from the n = 15 level to the n = 2 level? (RH = 1.097 × 10^7 m-1.)
a. 1.0 × 10^-10 m
b. 2.0 × 10^-10 m
c. 4.1 × 10^-10 m
d. 8.1 × 10^-10 m
e. 1.6 × 10^-9 m
D
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The Copernican (heliocentric) model explained things better than the Ptolemaic (geocentric) model, except:
a. it did not explain the relative positions of stars as seen from Earth at different times of year. b. it did not explain why Mercury is always near the Sun. c. it was conceptually more complex than the Ptolemaic model. d. it did not explain planetary motion clearly. e. it required a great deal more mathematical calculation.
No radionuclides decay by emitting
a. protons. b. alpha particles. c. electrons. d. gamma rays.
How did the geocentric model and the heliocentric model of the universe explain retrograde motion?
What will be an ideal response?
"Physics" could best be described as the study of
A) atoms in motion. B) matter. C) the general principles underlying natural phenomena. D) the application of science to the needs of human beings. E) the absolute, or certain, truths about the natural world.