(a)[1]
State what the luminosity of a star means.
(b(i))[2]
Calculate the radiant flux intensity of the star’s radiation as seen from Earth. Include a unit with your answer.
(b(ii))[2]
Find the radius of the star.
(c)[3]
Explain how the surface temperature of a distant star may be found from the wavelength spectrum of the light emitted by the star.