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NEST2020PhysicsSemiconductors

The remote control of a TV emits infra-red light of wavelength 900 nm . The TV detector is made of a semiconductor whose band gap is x eV . The detector is shielded by a semiconductor optical filter whose band gap is y eV . From the four options below, select the best option for the TV to function.

Options

  1. Ax=1.2 and y=1.4
  2. Bx=1.1 and y=1.8
  3. Cx=2.2 and y=1.0
  4. Dx=2.0 and y=1.2

Correct answer

A. x=1.2 and y=1.4

Step-by-step solution

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