p39_019 - 19. The energy of an incident photon is E = hf =...

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19. The energy of an incident photon is E = hf = hc/λ ,where h is the Planck constant, f is the frequency of the electromagnetic radiation, and λ is its wavelength. The kinetic energy of the most energetic electron emitted is K m = E Φ=( hc/λ ) Φ, where Φ is the work function for sodium. The stopping potential
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