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    desigonzalez's Avatar
    desigonzalez Posts: 5, Reputation: 1
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    #1

    Dec 3, 2004, 09:51 PM
    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?
    urmod4u's Avatar
    urmod4u Posts: 248, Reputation: 4
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    #2

    Dec 5, 2004, 04:27 PM
    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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