Question

A star’s apparent brightness is dependent upon

a.
temperature.
c.
size.
b.
distance from Earth.
d.
All of the above.

Answer 1

D. All of the above cuz greater the temperature more the star will glow.. Obviously size and distance matters...more its distance from earth less will be its appparent brightness. Hope it helps

Answer 2

Answer: The correct answer is option d.

Step-by-step explanation:

Apparent brightness depends on two factors: Luminosity and location of the observer.

Luminosity is defined as the amount of energy that a star emits from its surface. It depends on the Temperature and radius (size) of the star.

`L\propto R^2T^4`

And, here observer is Earth, so the apparent brightness will depend on the distance of star from Earth.

Hence, the correct option is Option d.