Question

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 infrared region.

Answer 1

Answer: (D)

The radiation emitted is in the infrared region.

As human body has temperature of its own, thus it also emits thermal radiation in infrared region but not in visible or UV region.

This is because the human body does not have that high temperature which is required to emit visible and UV radiation. The human body is hot enough to radiate in infrared region.