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A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can be detect a signal of wavelength
Options
(a) 4000 nm
(b) 6000 nm
(c) 4000Å
(d) 6000Å
Correct Answer:
4000Å
Explanation:
λₘₐₓ = hc / E
= 6.6 x 10⁻³⁴ x 3 x 10⁸ / 2.5 x 1.6 x 10⁻¹⁹ = 5000Å
The wavelength detected by photodiode should be less than λₘₐₓ. Hence it can detect a signal of wavelength 4000Å.
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Topics: Electronic Devices
(124)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Energy in a current carrying coil is stored in the form of
- A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
- A thermally insulated rigid container contains an ideal gas heated by a filament
- An air bubble in a glass slab with refractive index 1.5 (near normal incidence)
- Three identical spheres, each of mass 3 kg are placed touching each other
Topics: Electronic Devices (124)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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