The sun approximates an ideal blackbody radiator at a temperature of 5825K. (a) By Wien’s Law, what is the peak wavelength of this distribution? (b) What is the energy of a blackbody photon at this wavelength? (c) Is this photon in the visible band of the electromagnetic spectrum and why or why not? (d) The Cosmic Microwave Background has a nearly perfect blackbody spectrum with a temperature of 2.73K. What is the peak blackbody wavelength?

The sun approximates an ideal blackbody radiator at a temperature of 5825K. (a) By Wien’s Law, what is the peak wavelength of this distribution? (b) What is the energy of a blackbody photon at this wavelength? (c) Is this photon in the visible band of the electromagnetic spectrum and why or why not? (d) The Cosmic Microwave Background has a nearly perfect blackbody spectrum with a temperature of 2.73K. What is the peak blackbody wavelength?

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter16: Cosmology

Section: Chapter Questions

Problem 10P

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Concept explainers

Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.

Question

The sun approximates an ideal blackbody radiator at a temperature of 5825K.

(a) By Wien’s Law, what is the peak wavelength of this distribution?

(b) What is the energy of a blackbody photon at this wavelength?

(d) The Cosmic Microwave Background has a nearly perfect blackbody spectrum with a temperature of 2.73K. What is the peak blackbody wavelength?

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