Question

all objects emit infrared waves as heat. special devices, such as thermal cameras, detect infrared waves. a thermal camera has many tiny sensors. when an infrared wave hits a sensor, an electric signal is produced. this signal is converted into a temperature and assigned a color. the temperatures and colors from each sensor are combined to produce a thermal image.
this picture shows a person using a thermal camera. in the thermal image, warmer objects look yellow, while cooler objects look blue. the scale shows the temperature range for each color.
which part of the room is warmest according to the thermal image?
the walls around the windows
the windows and their frames
the radiators under the windows

Explanation:

From the thermal image's color scale, warmer objects are yellow/red. The radiators under the windows show warmer colors (red/yellow) compared to walls (blue/purple) and windows (blue/purple). Radiators produce heat, so they're warmer.

Answer:

the radiators under the windows