Physics · Semiconductor Devices
A photodiode is made of a semiconductor with a bandgap of 1.42 eV. Given that Planck's constant is 6.626 × 10-34 Js, the speed of light in vacuum is 3 × 108 m/s, and 1 eV = 1.6 × 10-19 J, the cut-off wavelength (in nanometers) of the photodiode is approximately:
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