Absorbtion,reflection,and emission.

  • #1
137
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I want to see if I understand these rules correctly. Us humans emit mainly in the infrared, that can be described by wiens law, but when visible radiation falls upon us, our body absorbs some part of the white light, but reflects whatever it doesn't. Smurf's for example reflect the blue part of visible radiation, while absorbing all other parts of the visible spectra.

And if emission is when an object emits electromagnetic radiation, isn't that the same as reflection? Or are they different? Is emission when it comes from the objects own thermal energy, and reflection when it comes from another object emitting it? And why is it that particles can be reflected, instead of completely absorbed and emitted?
 
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Answers and Replies

  • #2
195
2
Is emission when it comes from the objects own thermal energy, and reflection when it comes from another object emitting it?
yes
And why is it that particles can be reflected, instead of completely absorbed and emitted?
by particles, do you mean photons?
Light of only certain frequencies can be absorbed by an object, such as the ones that cause electronics excitations, phononic (vibrational) excitations, ... These may later be emitted. The other frequencies just get reflected.
 

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