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NEET 2008 (AIPMT) · Special Purpose Diodes

Special Purpose Diodes question from NEET 2008 (AIPMT)

Q95NEET 2008 · AIPMTEasy

Special Purpose Diodes

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

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Answer: (d)

  1. Minimum frequency: hν=Eg⇒ν=Eghh\nu = E_g \Rightarrow \nu = \dfrac{E_g}{h}
  2. ν=2.0×1.6×10−196.63×10−34≈4.8×1014\nu = \dfrac{2.0\times1.6\times10^{-19}}{6.63\times10^{-34}} \approx 4.8\times10^{14} Hz
  3. So the answer is (d) 5×10145\times10^{14} Hz.
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