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Chapter 41: Q. 18 (page 1207)
sodium atoms are excited to the state at s. How many of these atoms remain in the state at
(a)
(b), and
(c) ?
(a). The atoms is .
(b). The atoms is .
(c). The atoms is.
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Three electrons are in a one-dimensional rigid box (i.e., an infinite potential well) of length . Two are in the n = 1 state and one is in the n = 6 state. The selection rule for the rigid box allows only those transitions for which n is odd.
a. Draw an energy-level diagram. On it, show the filled levels and show all transitions that could emit a photon.
b. What are all the possible wavelengths that could be emitted by this system?
An atom in an excited state has a % chance of emitting a photon in . What is the lifetime of the excited state?
Does each of the configurations in FIGURE Qrepresent a possible electron configuration of an element? If so,
(i) identify the element and
(ii) determine whether this is the ground state or an excited state. If not, why not?
What are and (as a multiple of) of a hydrogen atom in the state?
a. Find an expression in terms of for the half-life of a sample of excited atoms. The half-life is the time at which half of the excited atoms have undergone a quantum jump and emitted a photon.
b. What is the half-life of the state of sodium?
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