Question

infrared waves have wavelengths between $10^{-7}$ meters and $10^{-2}$ meters. warmer objects emit infrared waves with shorter wavelengths and higher frequencies than cooler objects.
according to the thermal image, which part of the room emits the highest-energy infrared waves?
the walls around the windows
the radiators under the windows
the windows and their frames

Explanation:

Higher temperature objects emit higher-energy infrared waves (shorter wavelength, higher frequency). The thermal scale shows warmer objects are yellow/orange; the radiators under the windows appear as the warmest (orange/yellow) area in the thermal image, meaning they have the highest temperature and emit the highest-energy infrared waves.

Answer:

the radiators under the windows