JEE Main 2025 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 8 April 2025, Shift 2, Physics Q50

Question 50 of 75 in this shift, Physics question 25 of 25, Section B.

An electron is released from rest near an infinite non-conducting sheet of uniform charge density '

-\sigma

' .The rate of change of de-Broglie wave length associated with the electron varies inversely as

n^{th}

power of time. The numerical value of n is __________.

Official answer

NTA final key.

Chapter: Dual Nature of Radiation and Matter
Topic: Matter Waves
Idea tested: Time Rate of Change of Wavelength

Same idea in other shifts

Asked 3× in all

27 Jul 2022, Shift 1 · Q47An electron (mass m) with an initial velocity $\vec{v}=v_0\hat{i}$ ( $v_0>0$ ) is moving in an electric field $\vec{E}=-E_0\hat{i}$ …MediumSingle correct
9 Jan 2020, Shift 2 · Q18An electron of mass $m$ and magnitude of charge $|e|$ initially at rest gets accelerated by a constant electric field $E$ . The rate of…MediumSingle 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.