. Point source S is radiating light equally in all directions. The amount
passing through an area A varies with the distance ...
Science - Formulas. ... Physics - Formulas - Luminosity ... if we know distance and
brightness of a star, we can determine its Luminosity (or actual brightness):.
How is this equation derived? It is simply an application of the luminosity ratio
Luminosity is the total energy that a star produces in one second. It depends on
both the radius of the star and on its surface temperature. One can calculate ...
A star with a radius like that of the sun and a surface temperature twice that of the
sun, will have luminosity _____ times as great as the sun's luminosity.
Feb 10, 2010 ... Best Answer: The formula for the Luminosity L = Area * Energy Flux = 4pi R^2 *
sigma T^4, where R is the radius and T the temperature.
The difference between luminosity and apparent brightness depends on distance
. ... Thus, the equation for the apparent brightness of a light source is given by ...
The luminosity of a star depends upon radius and surface temperature. ... In the
equation below L = luminosity and R = radius. Let's say the radius of the star is 5
The luminosity of a star is given by the equation. L = 4pR<sup>2</sup>s T<sup>4</sup>,. Where L is the
luminosity in Watts, R is the radius in meters, s is the Stefan-Boltzmann constant
Dec 26, 2012 ... Luminosity of a Star. ... Introductory Astronomy: Luminosity, Temperature, and
Surface Area - Duration: 16:15. P.E. Robinson 3,999 views. 16:15.