If you decrease the temperature of an object, the amount of power emitted at 1000 nm will increase or decrease

Question

Would the power already at 1000 nm increase or decrease? Why?

Answer 1

There is no way of knowing from that information.

Black body radiation follows a peaked curve. The position of the peak wavelength depends on temperature. Lowering the temperature moves the peak to longer wavelengths, but to know whether this reduces or increses power at a given wavelength you need to know where the peak is *now*.

Answer 2

Epid is wrong.  The power decreases.  Certainly the blackbody spectrum is peaked and the peak depends on the temperature.  But it is also true that the light emitted at ALL wavelengths decreases as you lower the temperature.  So the peak will shift to lower frequency and the power intensity will decrease at the same time, resulting in a peak that was lower at the low temperature than amount of light at the given frequency at high temperature.  If you want a more indepth answer, you should look in a quantum mechanics book on blackbody radiation.