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Atoms and Nuclei Class 12 JEE Questions and Answers

Update on: 14 Jan 2023, 07:30 PM

Atoms and Nuclei Class 12 JEE Questions

Many important questions are formed in competitive exams like CUET, JEE, NEET, and boards from Class 12 Physics. Below, we have provided Important Questions from Class 12 Physics Unit 8, Atoms and Nuclei for your JEE Mains 2023 preparation. You can check it here for revision purposes.

Latest: Dual Nature of Radiation and Matter Class 12 JEE Questions and Answers

Important: JEE Mains Previous Year Question Papers – For Exam 2023 | Free PDF Download

Also Check out: 30 Days JEE Main Planner to Boost Your JEE Main 2023 Preparation

Practice from – JEE Main Sample Papers 2023 With Answers: FREE PDF Download

Atoms and Nuclei Class 12 JEE Mains Questions and Answers

We’ve compiled a list of important questions about the Atoms and Nuclei Class 12 physics unit 8 that you should not miss while studying for your JEE Main Exams.

Q.1. A hydrogen-like atom (atomic number Z) is in a higher excited state of quantum number n. This excited atom can make a transition to the first excited state by successively emitting two photons of energies 10.20 eV and 17.00 eV respectively. Alternatively, the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energies 4.25 eV and 5.95 eV respectively. Determine the value of n. (Ionisation energy of hydrogen atom = 13.6 eV)

(a) n = 6 (b) n = 4 (c) n = 7 (d) n = 3

A.1. (a)

Q.2. Protons and singly ionized atoms of U235 and U238 are passed in turn (which means one after the other and not at the same time) through a velocity selector and then enter a uniform magnetic field. The protons describe semicircles of radius 10 mm. The separation between the ions of U235 and U238 after describing semicircle is given by 

 

 

 

 

(a) 60 mm (b) 30 mm
(c) 2350 mm (d) 2380 mm

A.2. (a)

Q.3. Which of the following products in a hydrogen atom are independent of the principal quantum number n? The symbols have their usual meanings.
(a) vn (b) Er (c) En (d) vr

A.3. (a,b)

Q.4. Hydrogen atom in its ground state is excited by means of monochromatic radiation of wavelength 970.6 Å. How many different wavelengths are possible in the resulting emission spectrum?

A.4. (6)

Q.5. Starting with a sample of pure 66Cu, 7/8 of it decays into Zn in 15 minutes. Find the corresponding half-life (in minutes).

A.5. (5)

Q.6. An ∝-particle and a proton are accelerated from rest by a potential difference of 100 V. After this, their de Broglie wavelengths are λa and λp respectively. Find the ratio λp / λ, to the nearest integer.

A.6. (3)

Comprehension Type

The key feature of Bohr’s theory of the spectrum of hydrogen atom is the quantization of angular momentum when an electron is revolving around a proton. We will extend this to a general rotational motion to find the quantized rotational energy of a diatomic molecule assuming it to be rigid. The rule to be applied is Bohr’s quantization condition.

Q.1.
Q1

 

 

 

 

 

A.1. (d)

Q.2. 
Q2

 

 

 

 

 

A.2. (b)

 

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One thing that is strongly recommended is that students prepare using NCERT textbooks. Toppers endorse NCERT as the finest book for JEE Main. NCERT is the foundation for these exams since they cover everything and consist of enormous information. Each and every line of NCERT must be clear and embedded in your mind to know the concepts better.

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JEE Main Guide

This series has separate books for physics, chemistry, and mathematics. MTG JEE Main Physics is the best book for JEE Main exam based on the latest pattern. The book comprises detailed theory with illustrations followed by Self-check MCQs. Chapter-wise MCQs and Numerical Value Questions with Hints and explanations are included for better understanding.

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This book for excelling in JEE MAIN has the real 104 online papers by NTA from 2019 to 2023. The book also provides 5 Mock test papers as per the latest pattern of JEE Main exam set by NTA in the end. MCQs and Numerical type questions are present in the book along with chapter-wise graphical analysis indicating the weightage of questions and topics.

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