Human skin (choose all that apply)
1. emits radiation well.
2. absorbs radiation well.
3. does not emit radiation well.
4. does not absorb radiation well.
5. has an emissivity of 0.
physics 100 @ ubc...nice
To determine the correct answers, let's go through each option:
1. Emits radiation well: This means that human skin releases or radiates heat energy effectively. The human body naturally emits thermal radiation in the form of infrared radiation, which is a type of electromagnetic radiation. So, human skin does emit radiation, making option 1 correct.
2. Absorbs radiation well: This refers to the ability of human skin to absorb incoming radiation from various sources. Human skin does have the ability to absorb certain types of radiation, particularly ultraviolet (UV) radiation from the sun. This absorption can lead to tanning or sunburns. Hence, option 2 is also correct.
3. Does not emit radiation well: This option contradicts option 1. As mentioned earlier, human skin does emit thermal radiation, so this statement is incorrect.
4. Does not absorb radiation well: This statement contradicts option 2. Human skin does absorb UV radiation, as explained above, so this option is also incorrect.
5. Has an emissivity of 0: Emissivity is a measure of how effectively an object radiates energy compared to a perfect black body. An emissivity of 0 would mean that human skin does not radiate any thermal energy, which is not true. The emissivity of human skin is not 0, so option 5 is incorrect.
Therefore, the correct answers are options 1 and 2: Human skin emits radiation well and absorbs radiation well.