From ea160147110dad8ecc64a9bb29623f80d5f4bcb5 Mon Sep 17 00:00:00 2001 From: Krishna Date: Mon, 18 Nov 2024 00:34:51 -0600 Subject: [PATCH] something --- content/physics/thermodynamics.md | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/content/physics/thermodynamics.md b/content/physics/thermodynamics.md index de6c9f1..b97e523 100644 --- a/content/physics/thermodynamics.md +++ b/content/physics/thermodynamics.md @@ -104,3 +104,13 @@ $$ This is where the Boltzmann law comes in to play. In order to calculate the emissivity of an object, you first need bot: the power of emissions from the target object, and the Power that would be emitted by a black body of the same temperature. This value can be procured using the Stefan Boltzmann Law of Radiation. Albedo, however, is a far simpler quantity, relying only on the input and output energies of the object. + +## Inverse Square Law and Apparent brightness + +If $b$ is the Power experienced at a radius $r$: + +$$ +b=\frac{L}{4\pi r^2} +$$ + +The above is true when $L$ is procured from the source, most likely using the Boltzmann's law.