As you will see, sometimes light behaves like waveform energy and sometimes it behaves like an extremely tiny particle. Dual nature of matter and light in 1905 albert einstein 18791955 developed a theory stating that light has a dual nature. Light acts not only as a wave, but also as a particle. Physics notes class 12 chapter 11 dual nature of radiation and matter cathode rays cathode rays are the stream of fast moving electrons. It follows chapter 21 of the textbook astronomy, the dual nature of light and matter. A complete understanding of dual nature of light was not achieved before the 20s in the 20th century. Anticipatory set attention grabber essential question. These notes are combined with chapter12 atoms and chapter nuclei. Dual nature of matter and light, define the dual nature of matter and light, describe the dual nature of matter and light, the waveparticle duality, define the wave particle duality. Dual nature of radiation and matte electron emission metals have free electrons negatively charged particles that are responsible for their conductivity. This is an introductory text intended for a oneyear introductory course of the type typically taken by biology majors, or for ap physics 1 and 2. He saw it in what is called second quantization, which generates an entirely new concept of fields. Aug 09, 2017 the properties of light and matter mentioned above lead us to the conclusion that both light and matter have a dual nature.
Physics notes class 12 pdf r k maliks newton classes. The properties of light and matter mentioned above lead us to the conclusion that both light and matter have a dual nature. This document is highly rated by class 12 students and has been viewed 2486 times. A certain photosensitive surface is exposed to a source and the corresponding current is being recorded as i. Dual nature of radiation and matter mcq questions with answers pdf question 1. The electrons flow through the evacuated glass tube, resulting in the current flow. Hey guys, to get in touch with me follow me on insta. However, the certain other phenomenon such as black body radiation and photoelectric effect can be explained only on the basis of its particle nature. Before einsteins contributions, physicists thought that a physical object could only behave like a wave or as a particle or as a group of particles. Chapter 11 dual nature of radiation and matter download in pdf.
It means when the matter is moving it shows the wave properties like interference, diffraction etc. Light shining on a metal will liberate electrons, creating electric current. Light is neither considered a wave nor a particle, instead it has characteristics of both a wave and a particle. Put simply, it is all about the dispersal of a short light wave into free electrons and a longer wave.
Wave theory of electromagnetic radiations explained the phenomenon of interference, diffraction and polarization. Jan 22, 2020 dual nature of radiation and matter class 12 physics mcqs pdf dual nature of radiation and matter mcq questions with answers pdf question 1. The dual nature of light refers to the fact that light can act as both a wave and a particle. Pdf in this paper is presented a simple alternative model of the dual nature of light, based on the deliberate inversion of the original statement. Its dual behavior is partly explained by 1doubleslit experiment of thomas young who represents the photons motion as a wave and also by 2the photoelectric effect in which the photon is considered as a particle. The best app for cbse students now provides dual nature of radiation and matter class 12 notes latest chapter wise notes for quick preparation of cbse board exams and schoolbased annual examinations. Name the phenomenon which establishes particle nature of light.
What is the result of light hitting an objectinteracting with matter. Describe the dual nature of light, as a continuous wave and a discrete particle photon, and give. The dual nature of light as reflected in the nobel archives. Mar 05, 2019 cbse class 12 physics chapter 11 dual nature of radiation and matter notes in pdf are available for free download in mycbseguide mobile app. Dual nature of matter and photoelectric effect askiitians. Among the many wavelike properties of light that demonstrate this are phenomena from diffraction to dispersion to the polarization of light. If they get sufficient energy electrons can escape out of the metal surface. In 1905 albert einstein 18791955 developed a theory stating that light has a dual nature. These observations indicate that when ultraviolet radiations fall on the emitter plate c, electrons are ejected from it which are attracted towards the positive, collector plate a by the electric field. In case of light some phenomenon like diffraction and interference can be explained on the basis of its wave character. Light and its nature have caused a lot of ink to flow during these last decades. Topics available are newtonian physics, conservation laws, vibrations and waves, electricity and magnetism, optics and modern physics.
Aug 09, 20 010 light and matter in this video paul andersen explains why light is important in probing matter. Electrons and atoms were originally considered as corpuscles. Experiments conducted by scientists of the time davisson, germer, thompson and others proved that electrons and other particles also had a dual nature and presented interference and diffraction properties besides their wellknown particle properties. Cbse class 12 physics chapter 11 dual nature of radiation and matter notes in pdf are available for free download in mycbseguide mobile app. This property makes a black body a perfect source of thermal radiation. The wave nature of light cannot account forindividual pixels in camera being hit. Dual nature of matter and radiation class 12 notes pdf. Describe the dual nature of light, as a continuous wave and a discrete particle photon. Scattering life of photon change of direction of propagation. Atomic models, dual nature of matter, luminiferous aether. Write one similarity and one difference between matter wave and an electromagnetic wave. Pdf simple alternative model of the dual nature of light and its.
The nature of light interaction of light and matter. However, the free electrons cannot normally escape out of the metal surface. As there is complete equivalence between matter mass and radia. Davissongermer experiment experimental details should be omitted. What will be the value of current if the distance between the source and the surface is reduced to half. Dual nature of matter and radiation notes for iit jee, download pdf.
Light travels in photons and the energy of individual photons is determined by plancks equation. Physics mcqs for class 12 with answers chapter 11 dual nature. Students will be able to explain the nature of light and understand that light is a form of energy and that it can be characterized as a wave. These video classes have been designed to suit the curriculum of cbse class 12 students. Light waves can interfere with other light waves, canceling or amplifying them. What is new is the idea that particles inherently show wavelike behavior, with similar consequences. These rays are produced in a discharge tube at a pressure below 0. Link of pdf file is given below at the end of the questions list.
Sometimes it behaves like a particle called a photon, which explains how light travels in straight lines 2. Algebra and trig are used, and there are optional calculusbased sections. Presentations ppt, key, pdf logging in or signing up. Albert einsteins photoelectric effect experiment proves that light can behave as a particle while thomas youngs doubleslit experiment shows that it also behaves as a wave. Cbse class 12 physics revision notes for chapter 11 dual. It must be kept in mind that particle and wave properties are elementary,we can only observe one property in given experiment,and not both at same time. This minimum frequency depends on the nature of material of the emitter plate. Scientists accept the evidence that supports this dual nature of light even though it intuitively doesnt make sense to us. Waveparticle duality publicized early in the debate about whether light was composed of particles or waves, a waveparticle dual nature soon was found to be characteristic of electrons as well. High school chemistrythe dual nature of light wikibooks. This lesson is designed for 3rd 5th grade students in a variety of school settings. My text for physical science and engineering majors is simple nature. When planck developed his formula for black body radiation. The evidence for the description of light as waves was well established at the turn of the century when the photoelectric effect introduced firm evidence of a particle nature as well.
How is the brightness of an object related to the total light output of the object and its distance. Dual nature of light electrical engineering portal. If the frequency is halved and intensity is doubled, the photocurrent becomes a quadrupled b doubled c halved. The dual nature of light has been extended to a similar duality in matter as well.
Sometimes it behaves like a wave, which explains how light bends or diffracts around an object 3. Photoelectric effect and dual nature of matter and. Some experiments prove that light possesses characteristics of a wave while other experiments prove light is a particle. The strange theory of light and matter download if you are still wondering how to get free pdf epub of book qed. Properties of cathode rays i cathode rays are not electromagnetic rays. Two beams one of red light and other of blue light of the same intensity are incident on a metallic surface to emit photoelectrons which one of the two beams emits electrons of greater kinetic energy. Aug 04, 2019 light, appears to have two different sets of behaviors under different circumstances. The dual nature of emr of discovered everyone knows that we can think of emr as a wave. Physics notes class 12 chapter 11 dual nature of radiation.
There are four types of electron emission, namely, thermionic emission, photoelectric emission, field emission and secondary emission. Just pick up a cd or dvd and watch the rainbow of colors flashing off the gratings grooves, and think. Chapter eleven dual nature of matternot to be republished. It required the very best scientific minds from all over the world to put together a theory to deal with the nature of light. Dual nature of radiation and matter class 12 ncert solutions. Free introductory physics textbooks for the high school or college level, available as large pdf files to download. Einstein proposed that light could behave simultaneously as a wave and as a particle.
It manifests itself as a wave in diffraction, interference, polarisation, etc. Now it is also known that the shorter the wavelength is, the more energy is carried by the beam. The nature of light as a wave a small disturbance in an electric field creates a small magnetic field, which in turn creates a small electric field, and so on light propagates itself by its bootstraps. Dual nature of radiation and matter class 12 notes physics. Waveparticle duality is the concept in quantum mechanics that every particle or quantum. Additional resources can be found in the related documents at the bottom of the page. Information and energy whose quantum unit is the photon. Experimental study of photoelectric effect when the light of. Einsteins photoelectric equationparticle nature of light.
Photoelectric effect nineteenth century physicists uncovered a most peculiar interaction between light and matter that they called the photoelectric effect. The generation, transport, manipulation, detection, and use of light are at the heart of. Physics mcqs for class 12 with answers chapter 11 dual. You can also download notes in pdf format at end of the post. Nonclassical correlations such an experiment is capable of unambiguously demonstrating the quantum nature of light.
Dual nature of matter and radiation class 12 notes pdf download the elementary particle in an atom having negative charge of magnitude 1. This video was produced for andrew mccandless honors physics class at nantucket high school in 20. Mead cites as the gross evidence of the exclusively wave nature of both light and matter the discovery between 1933 and 1996 of ten examples of pure wave phenomena, including the ubiquitous laser of cd players, the selfpropagating electrical currents of superconductors, and the boseeinstein condensate of atoms. The light propagates in the form of wave and interacts with matter in the form of discrete packets of energy called quantum of energy. Dual nature of matter and radiation class 12 notes pdf download. Describe the dual nature of light, as a continuous wave and a discrete. In this video tutorial, we will learn the dual nature of light and cover topics such as photoelectric effect, hellwach and lenards experiment, einsteins equation of pe current, concept of photon, and debroglies hypothesis. Physics videos by eugene khutoryansky 744,621 views. According to the classical theory of light and matter, the strength or amplitude of a light wave was in. Dual nature of radiation and matter class 12 physics mcqs pdf. This experiment captured the dual nature of the photon by a special camera for the first time ever.
1231 71 1304 714 413 1559 877 746 1286 824 1356 1476 286 1233 59 618 1460 471 968 39 301 505 957 1402 875 1486 288 1285 247 833 806 1118 280 1126 1492 271