Quantum Mechanics Solution Manual |
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© Leon van Dommelen |
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4.4.3.2 Solution esdb2-b
Question:
Continuing the previous question, evaluate the standard deviations in energy, square angular momentum, and angular momentum in the 2p state using inner products.
Answer:
For energy you have,
or multiplying out, noting that , so that 0,
which is zero. The same way, 0.
For angular momentum, you have, since the expectation value is zero,
or multiplying out,
which multiplies out to , so itself is .