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From ages, scientists were struggling to find the nature of light. Whether it travels in the form of waves or matter ? There are experiments to prove light travels in the form of waves but some experiments are also present to prove that light travels in the form of packets or matter and not wave.

So it was confusing to find whether light travels in the form of waves or matter and this is where dual nature comes in to help with the idea of whether light travel in the form of wave or matter.
The dual nature of radiation basically means that light travels in the form of both, waves and matter. This proves that why some experiment shows that light travels in the form of waves whereas some show it travels in the form of matter because light travels in both forms.

In this article, we are going to give you important topics and notes for chapter 11 Dual Nature of Radiation and Matter from class 12 Physics. We will provide you with handwritten notes and discuss some important topics for board exams as well as some basic concepts such as what are the dual natures of light.

## What is nature of light ?

As I told you earlier, there are two natures of light: (i) Wave nature and (ii) Matter and therefore light travels in form of both, in the waveform as well as in form of energy packets or matter.
Let’s learn about each of these forms:

### 1. Wave nature of light:

In this form as the name suggests, light travels in the form of wave and you will see energy continuation which leads to the main failure of this experiment ahead.
This nature of light is proved by the experiments diffraction of light and interference

If you don’t know about what is diffraction and interference we have covered this as well in our notes of chapter 9 Ray optics. To read that article Click here this will redirect you to that article.

### 2. Matter:

This theory says that light travels in the form of energy packets and not waves. These energy packets have finite shapes and mass and they move in a straight line. These packets hence have finite dimensions.

## Important Topics:

Important topics from Dual Nature of Radiation and Matter for boards are Planck’s idea, Hertz and Lenard’s Experiment, Threshold Frequency and Wave Function.

For 1 marker and MCQ for class 12 boards, conceptual questions from these topics as well as threshold frequency and wave function can be asked.

All these topics are provided in the notes given below, they are highly in-depth class 12 Physics notes of Dual Nature of Radiation and Matter so refer to them, it’s more than enough for boards.

## Handwritten notes:

This article is a brief summary of chapter 11, Dual Nature of Light and Matter. For all the derivation related to this chapter and other important things. I have prepared my special handwritten notes. These notes have all the derivation of this chapter and important topics for your board exam 🙂