A star with a radius like that of the Sun and a surface temperature three times that of the Sun, will have luminosity ______ times as great as the Sun’s luminosity.

Answer 1

Luminosity is proportional to the square of the radius and the fourth power of the temperature. Radius has no effect here since it is similar to the sun. However, with a temperature three times that of the sun the luminosity will be 3⁴ times that of the sun.