(a) Continuous and line spectrum: The spectrum which consists of all the wavelengths is called continuous spectrum. Ψ can he positive or negative but ‘I’:? TopperLearning’s Experts and Students has answered all of Structure Of Atom Plancks Quantum Theory Of CBSE Class 11 Science Chemistry questions in detail. According to this principle, in the ground state of an atom, the electrons occupy the lowest energy orbitals available to them, i.e., the orbitals are filled in order of increasing value of n + l. For the orbitals having the same value of n + 1, the orbital having lower value of n is filled up first. Velocity of light is 3 * 1010 cms-1. Electrons and the nucleus are held together by electrostatic forces of attraction. 2, 3. Wavelength is the distance from one wave peak to the next, which can be measured in meters. MP Board Class 12 Physics Model Question Paper: Marking Scheme, Weightage and Blueprint, MP Board Class 12 Hindi Model Question Paper: Marking Scheme, Weightage and Blueprint, MP Board Class 12 Economics Model Question Paper: Marking Scheme, Weightage and Blueprint, MP Board Class 12 Biology Model Question Paper: Marking Scheme, Weightage and Blueprint, MP Board Class 12 Mathematics Model Question Paper: Marking Scheme, Weightage and Blueprint, MP Board Class 12 Chemistry Model Question Paper: Marking Scheme, Weightage and Blueprint. where, h = Planck’s constant = 6.63 x 10-34 j-s, If n is the number of quanta of a particular frequency and ET be total energy then Et = nhv. Calculate the wavelength, frequency and wavenumber of a light wave whose period is 2.0 × 10–10 s. Q. Dual nature of radiation 1. photon. So, go ahead and check the Important Notes for CBSE Class 11 Chemistry Atomic Structure from this article. Quantum physics is easy to understand when you learn about it very carefully. According to Planck: E=h$\nu$, where h is Planck’s constant (6.62606957(29) x 10-34 J s), ν is the frequency, and E is energy of an electromagnetic wave. Wave–particle duality postulates that all particles exhibit both wave and particle properties. Particle Nature of Electromagnetic Radiation: Planck's Quantum Theory. The orbital wave function, Ψ has no significance, but Ψ2 has significance, it measures the electron probability density at a point In an atom. 1. CBSE Class 11 Chemistry Atomic Structure– Get here the Notes for CBSE Class 11 Chemistry Atomic Structure. (iii) Velocity (v) It is defined as the distance covered in one second by the waves. frequencies. What information is obtained from the cathode rays experiment about the structure of atom? SHORTEST WAVELENGTHS (MOST ENERGETIC PHOTONS) According to . Atom is a positive sphere with a number of electrons distributed within the sphere. Q. Some of the α-particles are deflected to certain angles, which means that there is positively mass present in atom. Bohr’s Model for Hydrogen Atom; 1.4.1 Explanation of Line Spectrum of Hydrogen; 1.4.2. Dual behavior of electromagnetic radiation: When a white light is passed through a prism, it splits into a series of coloured bands known as spectrum. Dual Nature of Radiation and Matter MCQ Questions with Answers Pdf Question 1. Electromagnetic wave theory was successful in explaining the properties of light such as interference. Energy is always emitted or absorbed as integral multiple of this quantum, i.e. Based upon α-particles scattering experiment. Using particle or quantum nature of radiation we can explain the phenomenon of photoelectric effect and Crompton effect. Q. Reflection, refraction etc., of the electromagnetic radiations was explained by the wave nature. 11. According to Planck’s quantum theory, 1. Number of electron ejected is directly proportional to intensity (or brightness) of light. We will learn the dual nature of light and electron, quantum mechanics, quantum numbers. An absorption spectra is obtained when a substance absorbs certain wavelengths and leave dark spaces in bright continuous spectrum. Q. There is characteristic minimum frequency (ν, Kinetic energy of ejected electrons is given by-. The phenomenon of black body radiation and photoelectric effect prove the particle nature of radiation. A central concept of quantum mechanics, this duality addresses the inability of classical concepts like "particle" and "wave" to fully describe the behavior of quantum-scale … Atom is the smallest particle of matter that can take part in a chemical reaction. Also known as plum pudding raisin pudding orwatermelon model. de-Broglie explains the dual nature of electron i.e.. both particle as well as wave nature. Particle Nature of Electromagnetic Radiation. An electromagnetic wave has the following characteristics: (i) Wavelength It is the distance between two successive crests or troughs of a wave. Wave nature of electromagnetic radiation failed to explain many phenomena such as black body radiation and photoelectric effect. Unlike cathode rays, the positively charged particles depend upon the nature of the gas from which these originate. Threshold frequency (vo) = minimum frequency of the radiation, Work function (Wo) = required minimum energy of the radiation, [Kinetic energy of ejected electron = h(v – vo), where; v = frequency of incident radiation. It is denoted by the Greek letter λ (lambda). Dual Nature of Radiation and Matter Class 12 Physics MCQs Pdf. Even before we entered the information age, it was recognized that material objects and the photons of electromagnetic radiation are, in essence, carriers of information. “It is denoted by m, or s. It indicates the direction of spinning of electron, i.e., clockwise or anti- clockwise. Number of orbitals in each subshell = ( 2l + 1), Number of orbitals in main energy level = n2, Spin Quantum Number (Uhlenbeck and Goldsmith). We simplify that evident God also exist in science. John Dalton proposed (in 1808) that atom is the smallest indivisible particle of matter. In this article we will discuss Max Planck’s quantum theory of radiation or quantum theory of radiation, black body radiation, electromagnetic radiation, evidences for a particle theory of energy. has an . Thus. Particle Nature of Electromagnetic Radiation : Planck’s Quantum Theory. As progress in the science field was happening, Maxwell’s suggestion about the wave nature of electromagnetic radiation was helpful in explaining the phenomena such as interference, diffraction etc. (c) Isotones Species having same number of neutrons are called isotopes, e.g., 1H3 and 2He4 are isotones. If the substance being heated is a black body. Wave–particle duality is the concept in quantum mechanics that every particle or quantum entity may be described as either a particle or a wave.It expresses the inability of the classical concepts "particle" or "wave" to fully describe the behaviour of quantum-scale objects. Entire mass of the atom is concentrated inside the nucleus. Class 11 Chemistry Structure of Atom Black body radiation and Photoelectric effect Particle nature of Electromagnetic radiations : There were two important phenomenon that couldn’t be explained by considering Light with wave character: It carries a unit positive charge (+1.6 * 10-19) C). It is denoted by v (nu). Bohr’s Model for Hydrogen Atom; 1.4.1 Explanation of Line Spectrum of Hydrogen; 1.4.2. until each orbital of the given subshell contains one electron. Max Planck (1858 1947) 18 Plancks theory 1918. Get all questions and answers of Structure Of Atom Plancks Quantum Theory of CBSE Class 11 Science Chemistry on TopperLearning. Dual Behaviour of Electromagnetic Radiation: Electromagnetic radiations possess both particle and wave nature. To simplify our discussion, consider a particle that can have only two possible states. The quantum nature of EM radiation and its interaction with matter. It contain three subatomic particles namely electrons, protons and neutrons, Electron was discovered as a result of study of cathode rays by JJ Thomson. Candidates who are ambitious to qualify the CBSE Class 11 Chemistry with good score can check this article for Notes. It IS given by Werner Heisenberg and Erwin Schrodinger, m = mass of electron, E = total energy of electron, U =potential energy of electron, h =Planck’s constant, Ψ (Psi) = wave function which gives the amplitude of wave. Well, Planck was basically the father of quantum mechanics. The energy is emitted from source continuously in the form of radiations and magnetic fields. Particle Nature of Electromagnetic Radiation : Planck explain the distribution of intensity of the radiation from black body as a function of frequency or wavelength at different temperatures. With the help of Notes, candidates can plan their Strategy for particular weaker section of the subject and study hard. • Also, as the temperature increases , maxima of the curve shifts to short wavelength. It tells about the number of subshells (s. p, d, f) in any main shell. Such a system is the simplest possible one for a quantum particle, and is also called, for obvious reasons as a two-state system. G = 6.67428 × 10 −11 N m 2 /kg 2 to Planck ’ s for! Electromagnetic waves or electromagnetic radiation: Planck ’ s theory of special relativity is built into of! ; – or pi ; +, pi ; – or pi ; – or ;... 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