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Red light-emitting diodes are made from GaAs and GaP
solid solutions, GaPxAs1 - x (see Exercise 12.79). The original
red LEDs emitted light with a wavelength of 660 nm. If we
assume that the band gap varies linearly with composition
between x = 0 and x = 1, estimate the composition (the
value of x) that is used in these LEDs.

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