JEE Main 2024PhysicsSemiconductorsHardMCQ

JEE Main 2024 — Semiconductors Question with Solution

JEE Main 2024 (01 Feb Shift 2)

Question

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be X8 eV.  The value of X is:

(Given h=6.6×10-34 J s, e=1.6×10-19 C)

Choose an option

Show full solutionCorrect option: A
Correct answer
A15

Step-by-step explanation

Given: Threshold wavelength =660 nm.

Therefore, energy required(or band gap energy) Eg=hcλ=6.6×10-34×3×108660×10-9 J

=6.6×10-34×3×108660×10-9×1.6×10-19 eV

=158eV

So, X=15.

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About this question

This is a previous-year question from JEE Main 2024, covering the Semiconductors chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.