(5 points) Find the expression for a standing 1D EM wave in a box of length L = $10^{-10}$ m, if the electric field at t = 0 is maximum and the wave is horizontally polarized. You are calculating the first 3 harmonics. Find the energy of the photons associated with these harmonics, if $E_{ph} = h\nu$, with h = $6.63 \times 10^{-34}$ Js.
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