JEE Main 2021 — Structure Of Atom Question with Solution
From: JEE Main 2021 (Online) 26th February Evening Shift
Question
A ball weighing 10 g is moving with a velocity of 90 ms1. If the uncertainty in its velocity is 5%, then the uncertainty in its position is ___________ 1033 m. (Rounded off to the nearest integer)
[Given : h = 6.63 1034 Js]
[Given : h = 6.63 1034 Js]
Enter your answer
Show full solutionCorrect answer: 1.17
Correct answer
1.17
Step-by-step explanation
m = 10 g = 102 Kg
v = 90 m/sec.
= v 5% = 90 = 4.5 m/sec
m . v . x
102 4.5 x
x
x 1.17 1033 = x 1033
x = 1.17 1
v = 90 m/sec.
= v 5% = 90 = 4.5 m/sec
m . v . x
102 4.5 x
x
x 1.17 1033 = x 1033
x = 1.17 1
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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.