Note that in the above question, although the object still emits all colors of visible light, it appears blue now instead of white because of the significant difference in the intensity or amount of blue light radiated versus the amount of red light emitted.

Question

Click the + button that is to the left of the intensity scale to zoom in such that the top of the scale is at 0.8. Now slowly decrease the temperature from 5000K down to 300K (room temperature).Notice how the entire spectrum decreases in intensity and moves to the right into the infrared region. Even though the spectrum appears completely flat, objects at room temperature and below also emit their own light. If our eyes could detect infrared light, we would be able to see in the dark with warmer objects being brighter than others.In the introduction of this activity, we mentioned the temperature of your home on hot and cold days. Your body is kept warm in your home primarily by two ways: by direct contact with the air around you and by absorbing infrared light that is radiated from the walls. As you have seen in this activity, the light that is radiated from an object depends almost solely on the temperature of the object. Based on what you have learned here, what is one reason for feeling warmer in your house on a summer day versus a winter day even though your thermostat is set the same?
The walls of the house are warmer during the summer. Therefore, they radiate more infrared light that can serve to warm our body.

The walls of the house are warmer during the summer. Therefore, they radiate more visible light that can serve to warm our body.

The walls of the house are warmer during the summer. Therefore, they radiate more ultraviolet (UV) light that can serve to warm our body.

The temperature of the walls of the house has no effect on the light they radiate.

Answer 1

The correct reasoning is:

The walls of the house are warmer during the summer. Therefore, they radiate more infrared light that can serve to warm our body.

During the summer, the external temperature is higher, causing the walls of the house to absorb heat and subsequently emit more infrared radiation. This increased emission of infrared light contributes to the feeling of warmth, even if the thermostat is set to the same temperature.