College Physics 10th Edition by Raymond Serway,Chris Vuille

تمرين 25

Suppose a star with radius 8.50 × 10 8 m has a peak wavelength of 685 nm in the spectrum of its emitted radiation. (a) Find the energy of a photon with this wavelength. (b) What is the surface temperature of the star (c) At what rate is energy emitted from the star in the form of radiation Assume the star is a blackbody ( e = 1). (d) Using the answer to part (a), estimate the rate at which photons leave the surface of the star.