\[
\boxed{\text{radio, infrared, visible, ultraviolet, x-ray}}
\]
According to Planck's equation and Wien's displacement law, the peak wavelength of radiation emitted by a body is inversely proportional to its temperature. Therefore, if the temperature decreases, the peak wavelength increases, shifting to longer wavelengths. Longer wavelengths correspond to less energy.
\[
\boxed{\text{longer, less}}
\]