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)A photon of energy collides at an angie e with another photon of encrgy E. Prove that
the minimum value of permitting formation of a pair of particles of mass m is
2m e
E(1-cos 8)

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Scanned with CamScanner In a velocity selector, when an electric field of strength E and a magnetic field of strength B were used,particles with energy K and mass M were selected. With the same field E, if we want to select particles with energy 3K and mass M, then the magnetic field used is: Select one: 0.71 B 1.4 B noliill 0.58 B 3.0 B roglel äs 1.73 B Scanned with CamScanner
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.
Pleaseneed solution for no: (b) and (c)
What is the wavelength, in fm (femtometers, or 10^-15 m), of a proton travelling at 90% of the speed of light?