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  • Dec 3, 2004, 09:51 PM
    desigonzalez
    Waves
    How many photons of red light of wavelength 700nm do you need to get at least as much energy as one of blue light with wavelength 301nm?
  • Dec 5, 2004, 04:27 PM
    urmod4u
    700/301 times. That is 3 photons ("at least" - more than two, less than three) - because a photon cannot be cut into pieces.
    E=h*v
    H is Planck's constant, v is the frequency (this is not the letter v but the Greek letter "nu").
    The frequency is the speed (of light) divided by the wavelength.

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