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Homework Help: Formula relating specific heat and photons

  1. Apr 29, 2008 #1
    1. The problem statement, all variables and given/known data

    What is the algebraic expression for the number N of photons that must be absorbed to cause the indicated increase in temperature? Express your answer in terms of the wavelength λ, the specific heat capacity csh, the mass m of the glass plate, the increase in temperature Tdiff, Planck's constant h, and the speed c of light.

    2. Relevant equations
    Q = cm&t (& = delta)
    E = hf
    f = c/λ
    photon energy = hc/λ

    3. The attempt at a solution

    Putting them all together yields:

    csh * Tdiff

    But that's incorrect. If Q is energy (E) then hf = cm&t. Then c/λ is subbed for f. Am I missing a piece of the formulaic puzzle here?
  2. jcsd
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