What is the temperature inside the furnace?

Question

The blackbody radiation emitted from a furnace peaks at a wavelength of 4.1  10^-6 m (0.0000041 m). What is the temperature inside the furnace?

Answer 1

This is a straight application of Wein's Law which states, λ_peak * T = 2.898 X 10^-3 m*K.

You're given λ_peak in the problem. Can you take it from here?