ReinyDays
Gold Member
So, when the photon reflects from an object, it does so at a different frequency or wavelength? So the photon is converted from one of the invisible frequencies to something on the visible spectrum depending on what it bounces off of? The next question is, if the photon bounces off of a color…say blue…is it that some property of “blue” interacts with the photons that somehow changes it to travel at a different wavelength, that our eyes perceive as blue?
So, a photon travels at a certain frequency but when it reflects off of something, it reflects at a different frequency that we perceive as color.
That’s kind of interesting and it makes me think of another question lol. Does “color” exist? Think about it. Color is merely a wavelength of energy that our eyes perceive as color, right? So…what color is an apple when it’s in a pitch black room, where there is no light to reflect off of it to create that new wavelength? Is it still red? That’s kind of like when you start to dim a light, whatever object is in reach of the light starts getting darker and changing hues even, and can start to take on a more grey color and eventually the less light present, it starts to look black. This happens because less and less photons are causing reflections off of the object.
Hmm..
Reflection doesn't not change a photon's wavelength ... the tree absorbs red and blue light, and reflects green light away ... your blue paint absorbs red and yellow, reflecting the blue ... and reflection is an instantaneous process ... that's important ...
Alternately, we can have an absorption event, and an immediate re-radiation event at the same wavelength ... but these would be different photons ... and these events require time to occur ... what's called in the trades "performing work" ... during this time interval, the energy exists as added temperature to the material ...
The tricky part is that once a photon is absorbed, the energy can be re-radiated with two different photons, each a different color from the original ... just as long as the total energy is the same ... we could shine pure blue light on an object and have it return orange light ... or better shining UV and returning a rainbow of colors ...
Newton's idea of photons being particles works for just about everything human-sized ... larger, use Einstein; smaller, use Planck ... easy ...