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NEET2008PhysicsSemiconductorsActual

A p-n photodiode is made of a material with a band gap of 2.0 eV . The minimum frequency of the radiation that can be absorbed by the material is nearly

Options

  1. A10 10¹⁴ ~Hz
  2. B5 10¹⁴ ~Hz
  3. C1 10¹⁴ ~Hz
  4. D20 10¹⁴ ~Hz

Correct answer

B. 5 10¹⁴ ~Hz

Step-by-step solution

p-n photodiode is a semiconductor diode that produces a significant current when illuminated. It is reversed biased but is operated below the breakdown voltage. Energy of radiation = band gap energy ie, h v=2.0 eV or v= 2.0 1.6 10⁻¹⁹ 6.6 10⁻³⁴ 5 10¹⁴ ~Hz

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