A particular star has a radius of 8.58 ✕ 108 m. The peak intensity of the radiation it emits is at a wavelength of 682 nm.
(a)
What is the energy (in J) of a photon with this wavelength?
J
(b)
What is the star's surface temperature (in K)? (Round your answer to at least the nearest integer.)
K
(c)
At what rate (in W) is energy emitted from the star in the form of radiation? Assume the star is a blackbody, with emissivity
e = 1.
W
(d)
Using the results from parts (a) and (c), estimate the rate (in photons/s) at which photons are emitted by the star.
photon/s
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