In contrast to older holiday lights that used incandescent bulbs with filaments (that always burned out), modern lights usually consist of light-emitting diodes (LEDs) that are constructed of different semiconductor materials to obtain different colors. Calculate the energies (in electron-volts, eV) of a photon emitted from red (700 nm) and blue (450 nm) LEDs. 1 eV = 1.602×10-19 J

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