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We may state that the energy E of a photon of frequency V is E = hv, where h is Plank’s constant. The momentum P of a photon is P = h/λ where X is the wavelength of the photon. From the above statement one may conclude that the wave velocity of light is equal to
  • 3 x 108 m/s 
  • E/p
  • Ep
  • (E/p)2

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