A Perfectly Black Sphere 18

question 2

Essay

A perfectly black sphere 18.0 cm in diameter is held at a temperature of 215°C.
(σ = 5.670 × 10^-8 W/m² ∙ K⁴,Wien displacement law constant is 2.90 × 10^-3 m ∙ K,
h = 6.626 × 10^-34 J ∙ s,c = 3.00 × 10⁸ m/s)
(a)Near what wavelength does this sphere radiate most strongly?
(b)If all the radiated energy were at the wavelength found in part (a),how many photons would the sphere emit each second?

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Definitions:

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A U.S. federal law granting eligible employees the right to take unpaid, job-protected leave for certain family and medical reasons.

Accrued Paid Sick Leave

The amount of paid sick leave time that an employee has earned and can use according to the employer's policy or relevant regulations.