JEE Main 2019 — Structure Of Atom Question with Solution
From: JEE Main 2019 (Online) 11th January Morning Slot
Question
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this purpose?
[RH = 1 105 cm–1, h = 6.6 10–34 Js, c = 3 108 ms–1]
[RH = 1 105 cm–1, h = 6.6 10–34 Js, c = 3 108 ms–1]
Choose an option
Show full solutionCorrect option: C
Correct answer
CPaschen, 3
Step-by-step explanation
Given, RH = 1 105 cm–1
= 10-5 cm
= 10-7 cm 100
= 100 nm
We know,
=
[For H atom Z = 1]
=
Given, = 900 nm
= 900
By checking each options you can see
when nL = 3 and nH = then
Option C is correct.
= 10-5 cm
= 10-7 cm 100
= 100 nm
We know,
=
[For H atom Z = 1]
=
Given, = 900 nm
= 900
By checking each options you can see
when nL = 3 and nH = then
Option C is correct.
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This is a previous-year question from JEE Main 2019, 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.