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JEE Main 2 September 2020, Shift 2, Chemistry Q46

Question 46 of 75 in this shift, Chemistry question 21 of 25.

The work function of sodium metal is

4.41\times10^{-19}

J. If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons will be (

h=6.63\times10^{-34}

J s;

c=3\times10^{8}

m/s) __________

\times10^{-21}

Official answer

222.00

NTA final key (Sep 2020).

Chapter: Structure of Atom
Topic: Bohr's Atomic Theory
Idea tested: Photoelectric Effect Coupling

Same idea in other shifts

Asked 3× in all

2 Apr 2026, Shift 2 · Q71The surface of sodium metal is irradiated with radiation of wavelength $x$ nm. The kinetic energy of ejected electrons is…EasyNumerical value
12 Apr 2023, Shift 1 · Q82Values of work function ( $W_0$ ) for a few metals are given below Metal: Li, Na, K, Mg, Cu, Ag $W_0$ /eV: 2.42, 2.3, 2.25, 3.7, 4.8, 4.3 The…EasyNumerical valueHas a figure

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.