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20 March, 19:31

Which statement about luminosity is NOT true?

A. It is commonly measured in watts.

B. It is valued at 1 for our sun.

C. It stands for the total energy output of a star

D. It increases from top to bottom on an H-R diagrams

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  1. 20 March, 20:24
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    Answer: D. It increases from top to bottom on an H-R diagrams

    Luminosity is defined in the wordbook as brightness of a celestial object. In astronomy, it stands for the total amount of energy emitted per unit time by a star, so C. is correct. It is measured in joules per second or watts so A is correct also. It is B, valued at 1 for our sun.

    In an H-R diagram, the energy of a star is plotted on the vertical axis. The lower or more negative the measure, the brighter the star, D is therefore not true.
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