State what luminosity of a star means.
The Sun has luminosity $3.83 \times 10^{26}\,\text{W}$. The Earth-Sun distance is $1.51 \times 10^{11}\,\text{m}$. Calculate the radiant flux intensity $F$ of the Sun at the Earth. Include a unit in your answer.
Use the data from (b) to determine the mass converted into energy each second in the Sun.
The radius of the Sun is $6.96 \times 10^{8}\,\text{m}$. Show that the surface temperature $T$ of the Sun is $5770\,\text{K}$.
The wavelength $\lambda_{\max}$ of light for which the greatest rate of emission occurs from the Sun is $5.00 \times 10^{-7}\,\text{m}$. The surface temperature of the star Sirius is $9940\,\text{K}$. Use information from (d) to find the wavelength of light for which the greatest rate of emission occurs from Sirius.