PS1 - Chem 120B Problem Set 1 Due: January 28, 2011 1. (i)...

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Unformatted text preview: Chem 120B Problem Set 1 Due: January 28, 2011 1. (i) Show that the mean square fluctuation in any quantity A can be written in terms of its mean and mean square values, ( ( A ) 2 ) = ( A 2 ) ( A ) 2 . (Here, as usual, the fluctuation in A is defined as A = A ( A ) .) (ii) Generalize this result to the case of two different fluctuation quantities, i.e., show that ( AB ) = ( AB ) ( A )( B ) . 2. Consider two fluctuating variables x and y , whose statistics are described by a probability distribution p ( x,y ) . (i) If fluctuations in x and y are statistically independent, then their joint distribution p ( x,y ) factorizes, p ( x,y ) = f ( x ) g ( y ) , where f ( x ) and g ( y ) are the distributions of x and y , respectively. Explain why this factorization is implied by independence of x and y . (It is not necessary to give a very detailed account of your reasoning here, but it is important that you convince yourself of this fact.) (ii) The average of a function F ( x,y ) of these two variables can be written ( F ) = integraldisplay dx integraldisplay dy p ( x,y ) F ( x,y ) Consider a function F ( x,y ) = A ( x ) B ( y ) that depends separably on x and y . Show that the average of F also factorizes, ( F ) = ( A ( x ) )( B ( y ) ) ....
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This note was uploaded on 09/12/2011 for the course CHEM 107B taught by Professor Jamesames during the Spring '09 term at UC Davis.

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PS1 - Chem 120B Problem Set 1 Due: January 28, 2011 1. (i)...

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