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# The laser in a DVD player emits light at a wavelength of 640 nm. The laser in a Blu-Ray player emits light at 405 nm. What are the photon energies of each laser, in eV?

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We can get the photon energy from the relation $E_{ph}=\frac{hc}{\lambda}$ so we write $E_{DVD}=\frac{1.24 \times 10 ^{-6}}{0.64 \times 10 ^{-6}}$ $E_{DVD}=1.94 \textrm{eV}$ $E_{BR}=\frac{1.24 \times 10 ^{-6}}{0.405 \times 10 ^{-6}}$ $E_{BR}=3.07 \textrm{eV}$

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