Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2009
Exam
NEET
Year
2009
Subject
Physics
Chapter
Semiconductors

NEET 2009 · Physics · Semiconductors

A p-n photodiode is fabricated from a semiconductor with a band gap...

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5eV2.5 \mathrm{eV}. It can detect a signal of wavelength :

Options

  1. A496A˚496 Å
  2. B6000A˚6000 Å
  3. C4000 nm4000 \mathrm{~nm}
  4. D6000 nm6000 \mathrm{~nm}

Correct answer

A. 496A˚496 Å

Step-by-step solution

λmax⁡=hceV=1242eVA˚2.5eV=4960A˚\begin{aligned} \lambda_{\max }& =\frac{\mathrm{hc}}{\mathrm{eV}}\\ & =\frac{1242 \mathrm{eV} Å}{2.5 \mathrm{eV}}=4960 Å \end{aligned}
Practice Semiconductors on Quantrex Academy →

More from Semiconductors

For two inputs A and B and output Y, the Boolean expression for NOR gate is MHT CET Medical 2026For an n-type semiconductor, the relation between the number density ' n_h ' and ' n_e '… MHT CET Medical 2026A silicon crystal is doped with 5 × 10^ 17 \ cm^ -3 atoms of boron. The electron… MHT CET Medical 2026If the current gain in common-base configuration (α ) of a transistor increases from 0.95… MHT CET Medical 2026Out of the following what is used to detect the intensity of light ? MHT CET Medical 2026The color of light emitted by an LED is determined primarily by which of the following… MHT CET Medical 2026Which of the following is true for a p-type semiconductor? MHT CET Medical 2026In case of semiconductors, the band gap between the valence band and conduction band is MHT CET Medical 2026 Full Semiconductors list All NEET PYQs