JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 29 January 2024, Shift 1, Physics Q46

Question 46 of 90 in this shift, Physics question 16 of 30, Section A.

The de-Broglie wavelength of an electron is the same as that of a photon. If velocity of electron is 25% of the velocity of light, then the ratio of K.E. of electron and K.E. of photon will be:

(1) $\frac{1}{8}$ Official answer
(2) $\frac{8}{1}$
(3) $\frac{1}{1}$
(4) $\frac{1}{4}$

Official answer

Option 1

NTA final key.

Chapter: Dual Nature of Radiation and Matter
Topic: Matter Waves
Idea tested: Electron vs Photon (Same Wavelength)

Same topic in other shifts

All Matter Waves questions

4 Apr 2026, Shift 2 · Q44The de Broglie wavelength associated with an electron accelerated through a potential difference V is $\lambda_e$ and the de Broglie…EasySingle correct
5 Apr 2026, Shift 1 · Q35An electron of mass $m$ is moving in an electric field $\vec{E} = -2E_0\hat{i}$ ( $E_0$ = constant $> 0$ ), with an initial velocity…MediumSingle correct
5 Apr 2026, Shift 2 · Q43An electron is travelling with a velocity $v$ in free space and when it enters a medium, its velocity is reduced by 20%. The de Broglie…EasySingle correct
6 Apr 2026, Shift 2 · Q47The de Broglie wavelength for an electron accelerated through the potential difference of $V_1$ volt is $\lambda_1$ . When the potential…EasyNumerical value
2 Apr 2025, Shift 2 · Q33An electron with mass $m$ with an initial velocity $(t=0)$ $\vec{v} = v_0\hat{i}$ $(v_0 > 0)$ enters a magnetic field…MediumSingle correct
7 Apr 2025, Shift 2 · Q43A photoemissive substance is illuminated with a radiation of wavelength $\lambda_i$ so that it releases electrons with de-Broglie…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 42 of the 174 JEE Main shifts held from 2017 to 2026.