Multiple choice

Brightness of the star depends on _____ and the total energy emitted per second.

  1. viscosity

  2. polarity

  3. luminosity

  4. electricity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Luminosity is the measure of the total energy emitted by a star per second across all wavelengths. The apparent brightness of a star as seen from Earth depends on both its intrinsic luminosity and its distance from us. More luminous stars appear brighter when viewed from the same distance.

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