Two stars, both of which behave like ideal blackbodies, radiate the same total energy per second. The

Question:

Two stars, both of which behave like ideal blackbodies, radiate the same total energy per second. The cooler one bas a surface temperature T and 3.0 times the diameter of the hotter star
(a) What is the temperature of the hotter star in terms of T?
(b) What is the ratio of the peak-intensity wavelength of the hot star to the peak intensity wavelength of the cool star?