Possible measurement, eigenvalues of eigenfunctions and probabilities

In summary, the conversation discusses finding the possible results of measurement for the angular wavefunction and their respective probabilities. The eigenvalue for ##\hat{L^2}## is determined to be ##2\hbar^2## and the general formula for computing probability for an observable and state is mentioned. The importance of providing more information and effort in a post to receive help is emphasized.
  • #1
unscientific
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Homework Statement



Suppose the angular wavefunction is ##\propto (\sqrt{2} cos(\theta) + sin (\theta) e^{-i\phi} - sin (\theta) e^{i\phi})##, find possible results of measurement of:

(a) ##\hat {L^2}##
(b)##\hat {L_z}##

and their respective probabilities.


Homework Equations





The Attempt at a Solution



Part (a)
Eigenvalue is ##2\hbar^2##. Thus that is the possible result. How do I find the probability of that outcome?
 
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  • #2
Ahem. I think you could put more than <nothing> in your "relevant equations" section. E.g., what are explicit expressions for your operators in this case? You could also write the general formula for computing a probability for a particular observable and a given state. You could also show some detail of how you arrived at the eigenvalue for ##\hat L^2##.

It also wouldn't hurt to state the source of your question.

Bear in mind that if you're unwilling to put more effort into your post, then why should others put effort into helping you?
 

1. What is a possible measurement in quantum mechanics?

A possible measurement in quantum mechanics refers to the act of observing or measuring a physical quantity, such as position or momentum, of a quantum system. This measurement can result in a specific value, known as an eigenvalue, which corresponds to a specific state or outcome of the system.

2. What are eigenvalues of eigenfunctions?

Eigenvalues of eigenfunctions are the possible outcomes or values that can be obtained from a measurement of a specific quantum state or system. They correspond to the measurable properties of the system, such as energy, momentum, or spin.

3. How are eigenvalues and eigenfunctions related?

Eigenvalues and eigenfunctions are closely related in quantum mechanics. Eigenfunctions are mathematical functions that represent the possible states of a system, while eigenvalues are the corresponding measurable values that can be obtained from a measurement of that state.

4. Can the probability of obtaining a specific eigenvalue be calculated?

Yes, the probability of obtaining a specific eigenvalue can be calculated using the rules of quantum mechanics. The probability is determined by the square of the amplitude of the eigenfunction associated with that eigenvalue.

5. How does the uncertainty principle affect the probabilities of measurements?

The uncertainty principle states that it is impossible to know both the exact position and momentum of a particle simultaneously. This means that the probabilities of obtaining specific eigenvalues for these properties are not certain, and the more precisely one property is measured, the less certain the measurement of the other property becomes.

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