Question

We consider the radiation emitted by the human body. Which of the following statements is true

• A. The radiation is emitted only during the day
• B. The radiation is emitted during the summers and absorbed during the winters
• C. The radiation emitted lies in the ultraviolet region and hence is not visible
• D. The radiation emitted is in the infra-red region

Answer 1

Answer: (D)

The radiation emitted is in the infra-red region

Answer 2

Everybody at all time, at all temperatures emits radiation (except at $T = 0$). The radiation emitted by the human body is in the infra-red region.