JEE Main 2021 — Structure Of Atom Question with Solution
From: JEE Main 2021 (Online) 26th August Evening Shift
Question
A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3 1014 Hz. The velocity of ejected electron is ____________ 105 ms1 (Nearest integer)
[Use : h = 6.63 1034 Js, me = 9.0 1031 kg]
[Use : h = 6.63 1034 Js, me = 9.0 1031 kg]
Enter your answer
Show full solutionCorrect answer: 5
Correct answer
5
Step-by-step explanation
: speed of electron having max. K.E.
from Einstein equation : E = + K.E.max
= 5 105 m/sec.
from Einstein equation : E = + K.E.max
= 5 105 m/sec.
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Structure Of Atom chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2021, covering the Structure Of Atom chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.