# Tagged Questions

Luminosity is the energy radiated from a body per second.

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### Where does this Gamma formula come from?

This is the derivation of formula of Gamma Correction for CRT monitors. I am not finding this in any book or web-site. Books seem to derive this formula in different ways. Can anyone please tell me ...
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### Number of stars with apparent flux

The stars in our Galaxy have luminosities ranging from $L_{\text{min}}$ to $L_{\text{max}}$. Suppose that the number of stars per unit volume with luminosities in the range of $L$, $L+dL$ is $n(L)dL$. ...
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### Lorentz factor correction for luminosity

I am looking at the physics behind gamma ray bursts, working through a comprehensive review Kumar & Zhang (2014) (arXiv link). On page 92, Eq (111) the luminosity or a relativistically expanding ...
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### What is the relationship between Luminosity, Intensity, and Flux?

I am always confused by the terminology: In high energy particle scattering, and in particular, in the context of collider physics, what is the relationship between luminosity, intensity and flux? ...
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### How can I measure radiance?

I'd like to measure radiance in order to see how accurate the Lambertian, Phong models are and maybe to measure the "shininess constant" of a material (which appears in the Phong Model) on some ...
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### Interpreting LED output distribution specification

I have specifications for an LED which gives the following graph of spacial output distribution. I am not sure how to interpret this. As I see it, it could be one of two ways. To make ...
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### Observed flux from distant galaxies

If anyone is able to shed some light on this (pun intended). For an observed distant galaxy with known luminosity: L = 10^10 L(sun), the light is emitted at redshift z = 2 The Flux equation is F = ...