The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV of a 1.1-mm photon? (b) There are approximately 109 photons for each massive particle in deep space. Calculate the energy of 109 such photons. (c) If the average massive particle in space has a mass half that of a proton, what energy would be created byconverting its mass to energy? (d) Does this imply that space is “matter dominated”? Explain briefly.

Answered: The peak intensity of the CMBR occurs…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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The peak intensity of the CMBR occurs at a wavelength of 1.1 mm.
(a) What is the energy in eV of a 1.1-mm photon? (b) There are approximately 10⁹ photons for each massive particle in deep space. Calculate the energy of 10⁹ such photons. (c) If the average massive particle in space has a mass half that of a proton, what energy would be created by
converting its mass to energy? (d) Does this imply that space is “matter dominated”? Explain briefly.

Expert Solution

Part (a)

The wavelength,

Step 2

Planck’s constant,

Step 3

The speed of light,

Step 4

The energy in eV,

Step 5

The energy in eV of a 1.1-mm photon,

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