The Raspberry Pi 4 needs a fan

Post by tagrun » Fri, Jul 19, 2019, 4:47 PM UTC

arpa wrote: post #254

tagrun wrote: post #249

Earlier quoted context omitted.

Let me try again. Assistant Professor of Physics here (not a grad student). Yes, reflectance of room temperature aluminum at those wavelengths is pretty good (not true for all metals BTW). Yes, this usually makes it hard to distinguish thermal radiation and reflected radiation with metals. What are you trying to say though? That whatever comes off from a metal must always be a reflection coming from somewhere else? >…

Genuinely curious person here. What is the key reason to use photon size instead of wavelenght? To stress the quantifiableness of the radiation being capured by the thermal camera? To be honest it is the first time i've seen photon size semicasually mentioned in a conversation. Then again i only had physics in high school.

Post by arpa » Sat, Jul 27, 2019, 1:55 PM UTC

tagrun wrote: post #291

arpa wrote: post #254

Earlier quoted context omitted.

Genuinely curious person here. What is the key reason to use photon size instead of wavelenght? To stress the quantifiableness of the radiation being capured by the thermal camera? To be honest it is the first time i've seen photon size semicasually mentioned in a conversation. Then again i only had physics in high school.

They're the same thing: de Broglie wavelength would be the closest thing if you want to assign an effective "size" to a particle.