3. Consider a system that is initially in the state: 1 (0,6)=(0,0)+(0,0)+ }¥³ (0, 0), where Yor lm) are spherical harmonics. (a) Given that L+|lm) = [(1+1) ) − m(m + 1)]¹/²ħ|l(m + 1)), find (v|Ĺ+|V). (b) If Ĺ is measured, what values would be obtained and with what probabil- ities? (c) If Ĺz is measured, what can you say about the result of a subsequent measurement of Ĺz on the same system? (d) For hydrogen atoms in a strong magnetic field there are 6 component lines for a 2PJ to 2S1/2 transition. Although there are 6 components, there are only 3 distinct transition energies. Explain this observation in terms of the available states designated by magnetic quantum numbers m. You can assume that the direction of the spin of the electron does not change in the transition. (e) In this context what criterion is used to designate an external magnetic field as weak or strong? (f) How many components would you predict for the same transition in the absence of an external magnetic field? Be sure to explain your reasoning.

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3. Consider a system that is initially in the state:
1
(0,6)=(0,0)+(0,0)+ }¥³ (0, 0),
where Yor lm) are spherical harmonics.
(a) Given that L+|lm) = [(1+1) ) − m(m + 1)]¹/²ħ|l(m + 1)), find (v|Ĺ+|V).
(b) If Ĺ is measured, what values would be obtained and with what probabil-
ities?
(c) If Ĺz is measured, what can you say about the result of a subsequent
measurement of Ĺz on the same system?
(d) For hydrogen atoms in a strong magnetic field there are 6 component lines
for a 2PJ to 2S1/2 transition. Although there are 6 components, there are
only 3 distinct transition energies. Explain this observation in terms of
the available states designated by magnetic quantum numbers m. You can
assume that the direction of the spin of the electron does not change in
the transition.
(e) In this context what criterion is used to designate an external magnetic
field as weak or strong?
(f) How many components would you predict for the same transition in the
absence of an external magnetic field? Be sure to explain your reasoning.
Transcribed Image Text:3. Consider a system that is initially in the state: 1 (0,6)=(0,0)+(0,0)+ }¥³ (0, 0), where Yor lm) are spherical harmonics. (a) Given that L+|lm) = [(1+1) ) − m(m + 1)]¹/²ħ|l(m + 1)), find (v|Ĺ+|V). (b) If Ĺ is measured, what values would be obtained and with what probabil- ities? (c) If Ĺz is measured, what can you say about the result of a subsequent measurement of Ĺz on the same system? (d) For hydrogen atoms in a strong magnetic field there are 6 component lines for a 2PJ to 2S1/2 transition. Although there are 6 components, there are only 3 distinct transition energies. Explain this observation in terms of the available states designated by magnetic quantum numbers m. You can assume that the direction of the spin of the electron does not change in the transition. (e) In this context what criterion is used to designate an external magnetic field as weak or strong? (f) How many components would you predict for the same transition in the absence of an external magnetic field? Be sure to explain your reasoning.
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