Question

What is the Unit of luminosity?

Answer 1

Explanation:

Luminosity is an absolute measure of radiated electromagnetic power (light), the radiant power emitted by a light-emitting object.[1][2]

The Sun has an intrinsic luminosity of 3.83×1026 Watts. In astronomy, this amount is equal to one solar luminosity, represented by the symbol L⊙. A star with four times the radiative power of the sun has a luminosity of 4 L⊙.

In astronomy, luminosity is the total amount of electromagnetic energy emitted per unit of time by a star, galaxy, or other astronomical object.[3][4]

In SI units, luminosity is measured in joules per second, or watts. In astronomy, values for luminosity are often given in the terms of the luminosity of the Sun, L⊙. Luminosity can also be given in terms of the astronomical magnitude system: the absolute bolometric magnitude (Mbol) of an object is a logarithmic measure of its total energy emission rate, while absolute magnitude is a logarithmic measure of the luminosity within some specific wavelength range or filter band.

In contrast, the term brightness in astronomy is generally used to refer to an object's apparent brightness: that is, how bright an object appears to an observer. Apparent brightness depends on both the luminosity of the object and the distance between the object and observer, and also on any absorption of light along the path from object to observer. Apparent magnitude is a logarithmic measure of apparent brightness. The distance determined by luminosity measures can be somewhat ambiguous, and is thus sometimes called the luminosity distance.

Answer 2

$\huge \sf {Question :-}$

What is the Unit of luminosity?

$\huge \sf{Answer :-}$

The unit of Luminosity is Watts.