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Friday, 9 October

JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 25 July 2021, Shift 1, Chemistry Q53

Question 53 of 90 in this shift, Chemistry question 23 of 30, Section B.

A source of monochromatic radiation of wavelength 400 nm provides 1000 J of energy in 10 seconds. When this radiation falls on the surface of sodium, x×1020x\times10^{20} electrons are ejected per second. Assume that wavelength 400 nm is sufficient for ejection of electron from the surface of sodium metal. The value of xx is _________. (Nearest integer) (h=6.626×10−34h=6.626\times10^{-34} Js)

Official answer

2

NTA final key.

Chapter
Structure of Atom
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

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.