It is referred to as Photon in case of Light. The photoelectric emission is an instantaneous process. Hence, the matter is said to possess dual nature, i.e., it has both the properties of a particle and as well as a wave. 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Click here. IIT - JEE Main Important Questions of Dual Nature of Radiation and Matter Check all Solved Important Questions of Dual Nature of Radiation and Matter for the preparation of JEE Main Physics. The nature of the experiment determines whether a wave or a particle description is best suited for understanding the experimental result. For a given metal, there is a certain minimum frequency, called Threshold frequency, below which there is no photo-electric emission. Dual Nature of Matter Dual nature of matter is an important concept in JEE physics and is basically the study of different nature that a matter possesses or exhibits. 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. According to Neil Bohr “The wave and particle aspects of quantum entity are both necessary for a complete description.However the two aspects cannot be revealed simultaneously in a single experiment.The aspect which is revealed is determined by nature of experiment being done. DE-BROGLIE’S MATTER WAVES: DUAL NATURE OF MATTER:- This is based on wave mechanical concept of an electron in an atom.Albert Einstein proposed dual character of electromagnetic radiation in 1905, viz. J.J. Thomson and Sir William Crookes studied the discharge of electricity through gases. Your email address will not be published. This is called dual nature of matter. The wavelength of the wave associated with any material particle was calculated as: In case of photon, if it is assumed to have a wave character, its energy is given by E = hν where ν is the frequency of the wave and h is Pla… Click here. Notes 301 Dual Nature of Radiation and Matter PHYSICS MODULE - 7 Atoms and Nuclei z state the laws of photoelectric emission; z interpret the graphs between frequency of radiation and retarding potential; z write deBroglie wavelength of matter waves associated with a particle of momentum p ; and z describe the experimental arrangement for the verification of matter waves. The smallest packet of energy is called Quantum. What is De Broglie Hypothesis about Dual nature of matter? As the name suggests Dual Nature of Matter and Radiation chapter deals with the duality in the nature of matter, namely particle nature and a wave nature. Later on, it was experimentally found out that matter does possess the properties of a wave. De Broglie-Bohm Theory, which is also called as Bohmian Mechanics considers the wave nature predominates and thus the particle-wave duality goes vanished. Hello,Myself Lakhan Keshwani "Empowering Youth through Genius Learning".Need HELP or CONFUSED ? The universe is composed of … Click here. Lect 01: Photoelectric Effect-01. The experimental setup for Davisson and Germer Experiment is enclosed within a vacuum chamber. • There are four types of electron emission, namely, Thermionic Emission, Photoelectric Emission, Field Emission and secondary emission. This process takes place in the form of small packets. What happens in the process is when light is made to be incident on the metal surface, some of the electrons which are present near the surface will absorb enough energy from the incident radiation and thus overcomes the attraction of the positive ions. In case of light some phenomenon like diffraction and interference can be explained on the basis of its wave character. He presented the concept of dual nature of matter which was based on the following observations. MCQ on Dual Nature of Matter and Radiation. The notes are based on CBSE Syllabus. Effect of Intensity of incident light is linear with the photoelectric current for a fixed incident frequency as depicted in Figure 1 given below. Download Offline Apps and Solutions based on updated NCERT Books for 2020-21. NCERT Chapter 11. 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. Click here. Work Function: the minimum energy that is required to eject an electron from a metal surface. Figure 2, on the other hand, represents the diagram for Photoelectric effect where the ejection of electrons (marked in blue) from the metal surface is depicted when the light of suitable intensity (marked with red) is incident over it. Dual Nature of Matter Lewis de-Broglie proposed the dual nature of the matter in 1924 and stated that just like radiation, matter also has dual characteristics. Board notes offered by thinkIIT is helpful in securing good marks in class 12. Hence it was concluded that matter has dual nature .i.e.both particle as … Wave nature of matter. At about 0.01 mm of Hg and at high voltage invisible streams called cathode rays are emitted. How to find Vernier caliper least count formula? 2,968 Dual Nature of Radiation and Matter . The emitted electrons are called photoelectrons and the current so produced is called photoelectric current. Thus, the wave-particle duality is an important concept in quantum mechanics which describes that every particle or more specifically quantum entity may be expressed as either a particle or a wave. Lect 03: Wave Nature of Matter- De Broglie hypothesis. And with the help of either wave nature or particle nature, we can … To find out the relation between Stopping Potential (V0) and Threshold Frequency f, we have: H f= KE + W (KE is maximum Kinetic Energy=eV0 and W is the work function=hf0). De Broglie said that wave nature was symmetrical and that the two basic physical entities—matter and energy-must have symmetrical character. Thus, the deflections and scattering of electrons by the medium are prevented. Figure 1 shows the plot between Photoelectric Current and Intensity of light. Basic facts is constant , independent of nature of material used e = charge on electron m = mass of electron We know that Energy = q V One electron volt is the energy gained by electron when it is accelerated by 1 Volt of potential difference 1 ev = 1.602 ×10–19 J Dual Nature of Radiation and Matter Class 12 Notes Chapter 11. Multiple Choice Questions (MCQ I) UPES Dehradun Application 2021 CUCET Application 2021 (Phase-1) Indian Talent Olympiad Click Here. These solutions are useful for UP Board students also. In this video tutorial, we will learn the dual nature of light and cover topics such as photoelectric effect, Hellwach and Lenard's experiment, Einstein's equation of PE current, concept of photon, and de-Broglie's hypothesis. It has been observed that phenomenon like photoelectric effect and the compton effect could be explained if electromagnetic radiations were supposed to consists of packets of energy called quanta or photon which behaves like particle and move through space with the velocity of light.On the other hand phenomena interference ,diffraction and polarization could be explained if light is treated as wave phenomenon. Physics Important Questions Class 12 are given below. The properties of light and matter mentioned above lead us to the conclusion that both light and matter have dual wave particle nature. Cut-off Potential: The minimum negative or retarding potential V0 given to a plate for which photoelectric current becomes zero is called Cut-off or Stopping Potential. Photo-electric Emission: When the light of appropriate frequency is made to illuminate a metal surface, electrons are emitted from it. Physicswallah Typed Notes. The energy of a Quantum is directly proportional to the radiation frequency. Dual Nature of Radiation and Matter 2. The wave associated with the particle is called a matter wave or a de Broglie wave. Mathematically, it is given in the form, wavelength ƛ = h/P; where P is the momentum of the particle under study and h is Planck’s Constant. Dual nature of matter and De broglie wavelength. Thermionic Emission: Required thermal energy is provided to the free electrons by suitably heating it so as to enable them to come out of the metal. This concept further helps to modify the inability of the classical mechanic’s approach or theories to fully describe the behaviour of the matter. However, the certain other phenomenon such as black body radiation and photoelectric effect can be explained only on the basis of its particle nature. Here we have covered Important Questions on Dual Nature of Radiation and Matter for Class 12 Physics subject. Louis de Broglie, in 1924 extended the idea of photons to material particles such as electron and he proposed that matter also has a dual character-as wave and as particle.

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