Question

infrared waves have wavelengths between $10^{-7}$ meters and $10^{-3}$ 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 lowest - energy infrared waves?

• the walls around the windows
• the radiators under the windows
• the windows and their frames

Explanation:

Infrared energy emission is related to temperature (Warmer objects emit more infrared with shorter wavelengths, cooler ones less with longer). The thermal image's color scale shows cooler areas (like windows/frames, likely blue - cooler) emit lower - energy infrared (since lower energy means longer wavelength, associated with cooler temps). Radiators are warm (red/orange, more energy), walls around windows are warmer than windows. So windows and their frames are coolest, emit lowest - energy infrared.

Answer:

the windows and their frames