assignment6 - PHYS122 2010W Assignment 6 Due 17:00 Thursday...

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Unformatted text preview: PHYS122 2010W Assignment 6 Due: 17:00 Thursday 2010-03-04 PHYS122 Assignment 6 UW User ID:- Your UW User ID is not the same as your Student Number. Surname: Given Name: 1. (a) (2) Consider the quantity x = hc/λk B T . For what wavelength, λ long , will x be one at room temperature? λ long = (b) (2) What “colour” does this correspond to? (c) (2) Assuming that x as defined in (a) is small, perform a binomial expansion on the exponential in Planck’s Law, I ( λ,T ) = 2 πhc 2 λ 5 ( e hc/λk B T- 1 ) , and so find an expression for the long wavelength limit of the spectral radiance. I ( λ,T ) ≈ Page 1 of 5 PHYS122 Assignment 6 UW User ID:- Your UW User ID is not the same as your Student Number. Surname: Given Name: (d) (1) Replace the wavelength, λ , with x as defined in (a) in Planck’s expression for the spectral radiance. Calculate the derivative of the resulting expression for the spectral radiance with respect to x and so find an expression for x at which the spectral radiance is an extremum.is an extremum....
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assignment6 - PHYS122 2010W Assignment 6 Due 17:00 Thursday...

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