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    What is Quantum correlation

    i want to know what is physical idea behind "correlation function" as you know in quantum we define <B(t)B(s)> , B(t) and B(s) are operators in different time. and angular bracket shows averaging. is this definition say that if correlation function does not vanish then the observables...
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    What is Quantum correlation

    hi i want to know that what is quantum and classical correlation. is there any book or paper? thanks
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    What is Spin Hall effect and quantum hall effect

    hi what is Spin Hall effect and quantum hall effect? i can not find a good description on wikipedia.com do you have a good link or description? and another question: why in franck hertz experiment we use MERCURY instead of hydrogen? thanks
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    3 question of Ballmer experiment

    thanks another question in Ballmer series does the electron fall from layer n=4 to layer n=3 .if does why we see 3 line of light that are originated from falling electron from layers n=3 , 4 , 5 to layer n=2 but we do not see the line of light that is originated from falling electron from...
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    3 question of Ballmer experiment

    hi in Ballmer experiment we have a lamp of hydrogen gas and we put on it a high voltage in order to excite the electron . then we see 3 line of light. this 3 line of light are resulted from falling electron from layer with n=3 , 4 ,5 to layer with n=2. in Ballmer expriment which we see...
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