Question

i) which part of the room is coolest according to the thermal image?
ii) the walls around the windows
the windows and their frames
the radiators under the windows

Explanation:

Thermal images use color to represent temperature. Cooler areas are shown in cooler colors (like blue). In the image, the windows and their frames are shown in the coolest - colored regions (blue), indicating they have the lowest temperature compared to the other options. The walls around the windows (not the windows themselves) and the radiators (which would be warmer as they emit heat) are not the coolest.

Answer:

the windows and their frames