College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000



College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

The peak intensity of the CMBR occurs at a wavelength of 1.1 mm. (a) What is the energy in eV at 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 convening its mass to enemy? (d) Does this imply that space is “matter dominated”? Explain briefly.

To determine


The energy in eV of a 1.1-mm photon.



Wavelength = 1.1 mm

Formula used:

  E = hc/λ

E = Energy in eV

h = Planck's constant = 6.626 x 10-34 J·s

c=3 x 108 m/sec

  E = mc2


  E = hc/λ = (6.626 x 10-34 J·s) x (3 x 108 m/sec)/(1

To determine


The energy of 109photons.

To determine


The energy that is created by converting its mass to energy.

To determine


Whether this imply that space is matter dominated or not.

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