Consider the Bohr Theory Hydrogen atom
(a) How much energy is needed to cause a transition of an electron from the 2nd excited state to the 3rd excited state?
(b) What wavelength photon just has enough energy to initiate the transition?
(a) 0.661 eV
(b) 1.88 ?m
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Why is the cosmic microwave background (CMB) so cold if the early universe was so hot?
a. Enough time has passed for matter in the universe to release enough heat to cool down. b. The CMB constantly interacts with atoms, which effectively cool down the photons. c. The expansion of the universe has redshifted those photons to an effectively cooler temperature. d. Misleading; The Big Bang was initially hot but the CMB was released from cold material much later on.
The change in rotation rate of a spinning object caused by its size change is a consequence of
A. conservation of magnetic energy. B. the special theory of relativity. C. conservation of angular momentum. D. the law of action-reaction. E. None of these choices is correct.
A hypothetical atom has four distinct energy states. Assuming all transitions are possible, the number of spectral lines this atom can produce is
A) 5. B) 6. C) 7. D) 8. E) more than 8.
A neutral atom always contains
a. the same number of protons as it does neutrons. b. the same number of electrons as it does neutrons. c. the same number of protons as it does electrons. d. twice as many protons as it does neutrons. e. twice as many neutrons as it does protons.