# NCERT Solutions for Class 12 Physics Chapter 12 Atoms

NCERT solutions for class 12 Physics chapter 12 Atoms: Do you know that an atom tom is electrically neutral, which tells that atoms contain an equal number of positive and negative charges. The NCERT solutions for class 12 Physics chapter 12 Atoms talk about different models of the atom, their drawback, hydrogen spectra, and Debroglie hypothesis. The theories explained in the NCERT grade 12 Physics chapter 12 Atoms are very important in CBSE board exam point of view. To help you in your preparation we provide  NCERT solutions for class 12 Physics chapter 12 Atoms in detail.

## Some of the important formulas of NCERT grade 12 chapter 12 - Atoms are given below.

• The various series in line spectrum of atomic hydrogen are:

According to Bohr’s postulates for stationary orbit angular momentum

$L=\frac{nh}{2\pi}$

Where n is the quantum number

• The total energy of the electron in the stationary states of the hydrogen atom in electronvolt is given by

$E_n=-\frac{13.6}{n^2}eV$

$\lambda=\frac{h}{mv}$

Where ‘h’ is Planck's constant and mv is the momentum. This relation can be modified in terms of the kinetic energy of the particle. Try to derive it yourself.

12.1 Introduction

12.2 Alpha-particle Scattering And Rutherford’s Nuclear Model Of Atom

12.2.1 Alpha-particle Trajectory

## 12.2.2 Electron Orbits

12.3 Atomic Spectra

12.3.1 Spectral Series

12.4 Bohr Model Of The Hydrogen Atom

12.4.1 Energy Levels

12.5 The Line Spectra Of The Hydrogen Atom

12.6 De Broglie’s Explanation Of Bohr’s Second Postulate Of Quantisation

## The detailed solutions of NCERT solutions for class 12 Physics chapter 12 Atoms are given below:

View all solved exercise questions of class 12 Physics chapter 12 Atoms here.

## NCERT Solutions for Class 12 Physics- Chapter wise

 Chapter 1 Electric Charges and Fields Chapter 2 Electrostatic Potential and Capacitance Chapter 3 Current Electricity Chapter 4 Moving charges and magnetism Chapter 5 Magnetism and Matter Chapter 6 Electromagnetic Induction Chapter 7 Alternating Current Chapter 8 Electromagnetic Waves Chapter 9 Ray Optics and Optical Instruments Chapter 10 Wave Optics Chapter 11 Dual nature of radiation and matter Chapter 13 Nuclei Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits