Question

A particular star has a radius of 8.58 ✕ 108 m. The peak intensity of the...

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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