The luminosity class of a star (I,II,III,IV,or V)is MOST closely related to which physical characteristic of the star?

Question

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The luminosity class of a star is most closely related to its radius, which is directly related to the amount of energy it emits. A smaller radius corresponds to a lower luminosity and vice versa. The surface temperature and chemical composition can also affect a star's luminosity, but they do not have as direct of a relationship as radius. Radial velocity is a measure of a star's motion towards or away from us and is not directly related to its luminosity class.

The Luminosity Class of a Star (I,II,III,IV,or V)is MOST Closely