What type of star has an absolute brightness of 5 and a surface temperature around 3,000 °c?

a supergiant
b giant
c main sequence
d dwarf

Answer : The correct answer is option A : Supergiants

Explanation :

In the above graph absolute brightness is marked on y-axis and surface temperature is marked on x-axis.

To find out what type of star has an absolute brightness of 5 and a surface temperature around 3,000 °C, we will draw a straight line from x axis which represents a temperature of 3,000 °C and another straight line from y-axis which represents absolute brightness of 5.

From the attached graph we can see that these 2 lines meet in the region shown by Supergiants

Therefore we can say that, Supergiants has an absolute brightness of 5 and a surface temperature around 3,000 °C

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements