NCERT Solutions for Class 12 Physics, Chapter 11 - Dual Nature of Radiation and Matter

In this chapter, you’ll study the dual nature of radiation and matter. In physics, it is important to understand the wave nature of light. Significant experiments and observations done by Maxwell and Hertz helped in understanding the equations of electromagnetism and generation and detection of electromagnetic waves respectively. Further, the discovery of X-rays by Roentgen in 1895, and of the electron by J. J. Thomson in 1897, helped in understanding the dual nature of radiation and matter. In this chapter, you’ll study about how electron emission occurs, what do you mean by photoelectric effect, crucial observations made by the famous scientist Hertz, Hallwachs and Lenard., experimental study of photoelectric effect, wave theory of light, photoelectric equation presented by Einstein, what is photon and noteworthy experiments made by Davisson and Germer.

Thus, an in-depth study of Class 12 Physics NCERT Solutions Chapter 11 will give you a good understanding of significant aspects of Dual nature of radiation and matter.

Let’s take a look at topics and sub-topics of Class 12 Physics Chapter 11- Dual Nature of Radiation and Matter

11.1 Introduction

11.2 Electron Emission

11.3 Photoelectric Effect

11.3.1 Hertz’s observations

11.3.2 Hallwachs’ and Lenard’s observations

11.4 Experimental Study of Photoelectric Effect

11.4.1 Effect of intensity of light on photocurrent

11.4.2 Effect of potential on photoelectric current

11.4.3 Effect of frequency of incident radiation on stopping potential

11.5 Photoelectric Effect and Wave Theory of Light

11.6 Einstein’s Photoelectric Equation: Energy Quantum of Radiation

11.7 Particle Nature of Light: The Photon

11.8 Wave Nature of Matter

11.9 Davisson and Germer Experiment

In Class 12 Physics Chapter 11, you will learn – 

Section 11.2 – In this section, you will study about electron emission and work functions of some metals. You’ll also acquire knowledge about some physical processes like Thermionic emission, Field emission and Photoelectric emission.

Section 11.3 – In this section, you’ll learn what photoelectric effect is all about and come across various significant observations made by Hertz’s, Wilhelm Hallwachs and Philipp Lenard regarding the phenomenon of photoelectric emission.

Section 11.4 – In this section, you’ll learn what is Experimental Study of Photoelectric Effect, the effect of intensity of light on photocurrent, the effect of potential on photoelectric current and also the effect of frequency of incident radiation on stopping potential. You’ll also study the diagram showing the variation of photoelectric current with the intensity of light and how different photosensitive materials respond differently to light.

Section 11.5 – In this section, you will study about Photoelectric Effect and Wave Theory of Light in detail.

Section 11.6 – In this section, you’ll acquire knowledge about Einstein’s Photoelectric Equation related to Energy Quantum of Radiation and learn various aspects related to it.

Section 11.7 – In this section, you’ll acquire knowledge about Particle Nature of Light: The Photon and will be able to answer the question – Is the light quantum of energy to be associated with a particle?

Section 11.8 – In this section, you’ll study the wave nature of matter. You’ll also learn what is de Broglie wavelength and Heisenberg’s uncertainty principle.

Section 11.9 – In this section, you’ll learn about the wave nature of electrons and related experiments made by C.J. Davisson and L.H. Germer in 1927 and independently by G.P. Thomson, in 1928 while observing diffraction effects with beams of electrons scattered by crystals.

In this chapter, you are provided with several examples with their solutions for clear understanding about Dual Nature of Radiation and Matter. To know more about NCERT Solutions for Class 12 Physics Chapter 11, you should explore the exercises mentioned in this chapter. You can also download the NCERT Solutions for Class 12 Physics Chapter 11 PDF, solved by our science experts.