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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 27 August 2021, Shift 1, Physics Q18

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

In a photoelectric experiment, increasing the intensity of incident light :
  1. (1)increases the number of photons incident and also increases the K.E. of the ejected electrons.
  2. (2)increases the number of photons incident and the K.E. of the ejected electrons remains unchanged.Official answer
  3. (3)increases the frequency of photons incident and increases the K.E. of the ejected electrons.
  4. (4)increases the frequency of photons incident and the K.E. of the ejected electrons remains unchanged.

Official answer

Option 2

NTA final key.

Chapter
Dual Nature of Radiation and Matter
Topic
Photoelectric Effect
Idea tested
Intensity vs Frequency Effects

Same idea in other shifts

Asked 3× in all
  1. 4 Apr 2024, Shift 1 · Q46Which figure shows the correct variation of applied potential difference (V) with photoelectric current (I) at two different intensities…EasyDiagram basedHas a figure
  2. 8 Apr 2023, Shift 2 · Q45In photo electric effect A. The photocurrent is proportional to the intensity of the incident radiation. B. Maximum Kinetic energy with…EasyOther

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.