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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 1 February 2024, Shift 2, Physics Q48

Question 48 of 90 in this shift, Physics question 18 of 30, Section A.

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)\left(\frac{X}{8}\right) eV. The value of X is : (Given, h=6.6×10−34h = 6.6\times10^{-34} Js, e=1.6×10−19e = 1.6\times10^{-19} C)
  1. (1)11
  2. (2)13
  3. (3)15Official answer
  4. (4)21

Official answer

Option 3

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Optoelectronic Diodes

Same idea in other shifts

Asked 3× in all
  1. 26 Feb 2021, Shift 1 · Q20LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted…EasySingle correct
  2. 5 Sep 2020, Shift 1 · Q19With increasing biasing voltage of a photodiode, the photocurrent magnitude :EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.