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Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be X 8 ⎛ ⎞ ⎜ ⎟ ⎝ ⎠ eV. The value of X is (Given, h = 6.6 × 10 –34 Js, e = 1.6 × 10 –19 C)

1. 13
2. 11
3. 21
4. 15

Correct answer: 15

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