Recent content by alizeid

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    Why is the expectation value of the commutator not zero in method 1?

    The expectation value of the commutator should NOT be zero. the commutator do not commut therefore the answer is wrong
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    Why is the expectation value of the commutator not zero in method 1?

    The real problem is I get the expectation value of the commutator to zero, even for operator | 45>. This can not be correct. I can not solve this problem, can you help me?
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    Why is the expectation value of the commutator not zero in method 1?

    why are they different operators? according to the book, they are the same
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    Why is the expectation value of the commutator not zero in method 1?

    I'm trying to extract the expected value of a |+45> polarized photon in the HV- base. I do it in two ways, one is correct and the other I get wrong answer. What am I doing wrong in the first method that is wrong? method 1 method 2 thanks in advance
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    How can I get only one single photon with a coherent light source?

    "Since the photon statistics follow a Poisson distribution you can achieve sources with a well defined probability ratio for the emission of one versus two or more photons" I do not really understand how the connection between reducing intensity and Poisson distribution. If we have 10 ^ 15...
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    How can I get only one single photon with a coherent light source?

    Hi! We will make a lab analogous to the stern gerlach experiments but with polarized light. How can we get only one single photon in experiment with a coherent light source? I'm going to make a lab where we need to get in only one single photo at a time. I have read that you can use some...
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    Special theory of relativity, a collision between two partic

    Thanks for the tip but is it correct answer?
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    Special theory of relativity, a collision between two partic

    A particle of mass m comes with the speed 0.6c and collides with another particle of mass m which is at rest. In the collision melts the particles together and form a particle. What is the mass and velocity of the particle is formed? solution: The momentum and the total energy is conserved...
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    Mean free path of a gas atomic

    http://www.pluggakuten.se/wiki/images/3/3e/Prov221.JPG Solution
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    Solving Special Relativity: Tom's Journey Home

    sorry, can you explain more. i can't get it:-(
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    Solving Special Relativity: Tom's Journey Home

    The solution for a is 10 years. How I came up with this, You can take a look to the picture below. "How far away was Tom/Astrid when he/she turned around, and which year was on Earth then (as seen from earth)?" the answer is as seen from earth, she is 3 lightyears away from the Earth and and...
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    Solving Special Relativity: Tom's Journey Home

    Hi! I have difficulty with the English language but will try my best. I have recently begun to study the theory of special relativity. , I understand what the relativity of time is, relativity of length and Lorentz transformations. But I still have difficulty with solving data and do not know...
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