JEE Main 2018 — Structure Of Atom Question with Solution
From: JEE Main 2018 (Online) 15th April Evening Slot
Question
The de-Broglie's wavelength of electron present in first Bohr orbit of 'H' atom is :
Choose an option
Show full solutionCorrect option: B
Correct answer
B2 0.529
Step-by-step explanation
Radius r = 0.529
In first Bohr orbit of hydrogen atom radius,
r = 0.529 = 0.529
Angular momentum,
mvr =
for n = 1,
mvr =
2r = = [ as = ]
= 2r = 2 0.5 29
In first Bohr orbit of hydrogen atom radius,
r = 0.529 = 0.529
Angular momentum,
mvr =
for n = 1,
mvr =
2r = = [ as = ]
= 2r = 2 0.5 29
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 2018, 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.