Physics Dawn of Modern Physics BUMHS 2024
PMDC Verified Question 10 of 52
When placed in light which of the following can generate an output voltage across its electrodes?
A
p-n diode
B
Light emitting diode
C
Photo diode
D
All of the given options
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Photo diode
Concept:

Semiconductor devices can manipulate photons. Some emit photons when given electricity, while others create electricity when struck by photons.

Formula:

N/A

Solution:

  • A photodiode (or a photovoltaic cell) is specifically engineered with an active depletion region.


  • When photons strike it, they generate electron-hole pairs, which the internal electric field pushes to opposite ends.


  • This charge separation acts as a battery, generating a measurable output voltage/current purely from light exposure.


Why other options are incorrect:

A standard p-n diode is an electrical one-way valve, not designed for optical interactions. A Light Emitting Diode (LED) does the exact opposite—it consumes voltage to produce light.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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