Planck's Radiation Formula: Wavelength & How to Calculate

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Express the Planck radiation formula in terms of wavelength. How is this to be accomplished?
 
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how about making the substution \hbar \omega = \frac{\hbar c}{\lambda}?
 
Into what?
 
WHat is the expression that you have so far, if it is in terms of energy, E = \hbar \omega = \frac{\hbar c}{\lambda}, make the substitution and go from there.
 

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