N what band on the EM spectrum does Earth emit the majority of its radiation in?

Infrared Radiation (IR) part of the Electromagnetic Spectrum

Explanation:

Earth emits radiation in Longwave frequencies measured at 3.0 to 100 nanometers, mainly in the form of thermal radiation emitted by the earth's surface and organisms.

The earth re-emits the short wave radiation received by the sun that can be absorbed or reflected by the earth, but not all radiation emitted by the earth goes to space, much of the radiation is contained in the atmosphere by the greenhouse gases.