- cross-posted to:
- funny@lemmy.ml
- cross-posted to:
- funny@lemmy.ml
cross-posted from: https://lemmy.ml/post/19504984
It’s all relative
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Color is a social construct
Well, the names for different parts of the color spectrum are, I suppose. Wavelength of EM radiation, and how your brain interprets it as color, is ‘real’.
I think they were alluding to a different use of the word color.
What use? The only thing I can think of is ‘colourful’ language, which doesn’t seem to really make sense in this context.
“People of color.”
This technically goes down a very interesting line of thought that Vsauce covered once.
OK I need someone to explain this to me cause AFAIK light speed is constant no matter how fast moving the source is
So light is a wave. Shorter wavelengths are bluer longer wavelengths are redder. When you walk towards a wave you hit the peaks and troughs faster than had you been still. They come slower if you’re walking away from it. The Doppler effect is that but with light waves and velocities that make it relevant
Which is achieved by spacetime dilation which can in turn stretch or compress the light waves.
While it is true that space time dilation can cause red/blueshift, that is a distinct from the doppler effect which is the primary effect here.
(dilation plays only a small role: without time dilation our answer going from 700nm to 350nm would be 0.5c instead of the 0.6c calculated below)
Adding to the other comments; I once saw a interesting video of a visual demonstration of that effect and other weird things that happen close to the speed of light. It was this one if i remember correctly: https://www.youtube.com/watch?v=ge_j31Yx_yk
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How fast would the rose have to be going to blueshift that much? Someone please do the math
For a shift from about 700nm to 350nm: coming right at you at 0.6c
It would also have a kinetic energy of about 1.1234 Petajoules, on the order of magnitude of the Tsar Bomba
Kinetic energy or total energy? Assuming the rose weight 10 grams I get that 1.12PJ total energy, but only 0.23PJ is kinetic.
In hindsight I was a bit generous with the weight, I assumed 50g
chonk rose 😳
Only 10MT instead of 50 then?
One ton of TNT is 1E9 calories which is 4 gigajoules. So 0.2 petajoules should be only 50 kilotons of TNT?
A fart in the wind next to the Tsar Bomba. My disappointment is immeasurable and my day is ruined.
60% of lightspeed, according to another commenter.
Impossibly fast and it would have to be coming right at us.
Speed chills
Speed kills, coming down the mountain
Speed kills, coming down the street
Speed kills with presence of mind
Speed kills, if you know what I meandeleted by creator
