What is luminosity? the amount of energy a star emits in a unit of time the brightness of a star as seen from Earth the average temperature of a star during its life cycle the degree of shift toward the red end of the spectrum

Question

Heidi Bishop

Biology

4 January, 09:04

What is luminosity? the amount of energy a star emits in a unit of time the brightness of a star as seen from Earth the average temperature of a star during its life cycle the degree of shift toward the red end of the spectrum

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Answers (2)

Know the Answer?

Blaze Lloyd · Answer 1

In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object. So the answer is A.

Brenden Wagner · Answer 2

The amount of energy a star emits in a unit of time

Explanation:

Luminosity of a star is defined as the amount of energy emitted by it per unit time. It is measured in Watts.

The Luminosity of sun is about 3.8 * 10²⁶ W.

Apparent brightness can be measured using the Luminosity. Apparent brightness is the ratio of luminosity per square meter measured at certain distance from a star.