This is a question relating to Wien's displacement law for the Planck function. As we all know frequency and wavelength are related to the speed of light by:

$$\nu\lambda=c$$

However, why is it that:

$$\nu_{\mathrm{peak}}\lambda_{\mathrm{peak}}\neq{c}$$

Any explanations would be very much appreciated.

This is a question relating to Wien's displacement law for the Planck function. As we all know frequency and wavelength are related to the speed of light by:

$$\nu\lambda=c$$

However, why is it that:

$$\nu_{\mathrm{peak}}\lambda_{\mathrm{peak}}\neq{c}$$

Any explanations would be very much appreciated.

To all of the people wanting to know where this statement came from. It hasn't come from anywhere specific, is it a well known fact of the Planck function. $\lambda_{\mathrm{peak}}=0.290T^{-1}$ cm K and $\nu_{\mathrm{peak}}=5.88\times{10^{10}}T$ Hz K$^{-1}$.