Basic probability for quantum mechanics

athrun200
Messages
275
Reaction score
0

Homework Statement


See photo 1


Homework Equations


All formula for probability.


The Attempt at a Solution


See photo 2

It seems traditional formula (involve summation) can't be used.
So how to obtain answer for b.) and c.)?

Also, I am not sure for part a.
 

Attachments

  • 1.jpg
    1.jpg
    21.8 KB · Views: 433
  • 2.jpg
    2.jpg
    10 KB · Views: 421
Last edited:
Physics news on Phys.org
Is a sum always used to calculate expectation values?
 
George Jones said:
Is a sum always used to calculate expectation values?

I think that is average value.
To get expectation values, we need to have wave function.
However, it seems there is no relation between the needle and wave function
 
Let me try again.

Is a sum always used when calculating average values.
 

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Thread 'Help to convert units of a simple formula'

The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
View full post »

Similar threads

Sequential measurements in quantum mechanics
Replies
27
Views
1K
Griffiths' Quantum Mechanics Problem 4.27 : Diatomic particles
Replies
46
Views
673
E<V Potential Step Confusion
Replies
7
Views
2K
Quantum Tunelling Problem with Boundary Conditions
Replies
3
Views
2K
Particle in a cylindrically symmetric potential (Quantum mechanics)
Replies
5
Views
2K
Griffiths Quantum Mechanics 2nd edition Chapter 8 equation is confusing
Replies
2
Views
2K
Use of vector spaces in quantum mechanics
Replies
2
Views
2K
Two-level Quantum System - initial state
Replies
14
Views
2K
Quantum energy of a particle in a 2 dimensional space
Replies
1
Views
1K
I Discussion on the probabilistic interpretation of quantum mechanics
Replies
11
Views
824

Hot Threads

Recent Insights

Back
Top