The band gap in a semiconductor is 0.6 eV . The maximum wavelength of electromagnetic radiation which can create a hole electron pair in the semiconductor is equal to

[use $h c=1242 \mathrm{eV}-\mathrm{nm}$ ]

Identify the logic gate from the following with the same truth table characteristics of the logic circuit below

A $p-n$ junction is fabricated from a semiconductor with band gap of 2.8 eV . what approximate wavelength it cannot detect? [Use, $h=6 \times 10^{-34} \mathrm{~m}^2 \mathrm{~kg} / \mathrm{s}$ ]

Identify the logic operation performed by the following circuit.