Tav = sum of lives of all atoms / total number of atoms. Revision Notes on Atomic Physics e/m of an... About Us |
is the energy of electron in lower orbit and W. is the energy of electron in higher orbit. (d) The disintegration is accompanied by the emission of energy in terms of α, β and γ-rays either single or all at a time. (a) Orbital velocity of electron:- vn= 2πkZe2/nh. (d) Nuclear forces decrease very quickly with distance between two nucleons. (c) While revolving permitted orbit an electron possesses angular momentum L (= mvr) which is an integral multiple of h/2π. Density of nucleus = mass/volume = A/(4/3 πR. For S.I system (k=1/4πε0), RH = (1/8ε02) (me4/ch3), (a) For Lyman series:- 1/λ = R [1– 1/n2], n = 2,3,4…..∞, (b) For Balmer series:- 1/λ = R [1/22 – 1/n2], n =3,4,5…..∞, (c) For Paschen series:-1/λ = R [1/32 – 1/n2], n =4,5,6…..∞, (d) For Brackett series:-1/λ = R [1/42 – 1/n2], n =5,6,7…..∞, (e) P-fund series:-1/λ = R [1/52 – 1/n2], n =6,7,8…..∞, For the first excited state, n=2, W2 =W1/4 = (-13.6/4) eV = -3.4 eV, For the second excited state, n=3, W3 =W1/9 = (-13.6/9) eV = -1.51 eV, Similarly, for other excited states, W4 = -0.85 eV and W5 = -0.54 eV, Number of emission lines from excited state:-n = n(n-1)/2. KLB Physics Form 1. (b) A gradual change in the number of electrons reaching the collector due to change in its potential indicates that the electrons are ejected with a variety of velocities. 3. Here W2 is the energy of electron in lower orbit and W1 is the energy of electron in higher orbit. Effect of intensity of light:- The photoelectric currentis directly proportional to theintensity of incident radiation. It is a highly exothermic reaction and produces energy, on a scale, much higher than that produced in fission. Tutor log in |
Fission of U92235 by fast moving neutrons is represented as. Frequency, wavelength and wave number of radiation:-, Frequency, f = k2[2π2Z2me4/h3] [1/n12 – 1/n22]. Here λ is the wavelength of electron and d is distance between the planes. Modern Physics – I NOTES for IIT JEE 2020 pdf free download. (b) Law of conservation of number of nucleons. We do not support Piracy, this copy was provided for financially weak students. ( k = 1/4πε0), W = - (1/8ε02) [Z2me4/n2h2]. (c) Current is reduced to zero for some negative potential of collector indicating that there is some upper limit to the energy of electrons emitted. Nuclear Physics:- Branch of physics dealing with the study of nucleus is called nuclear Physics. 1. On absorbing energy they move to a higher orbit while emission of energy takes place when electrons move to a lower orbit. (f) Rate of disintegration of the radioactive substance, at any instant, is directly proportional to the number of atoms present at that instant. In such orbits they do not radiate any energy. are the masses of the proton and neutron respectively. Beta decay:- It is the process in which a parent nucleus decays into the daughter nucleus by ejecting an electron. 2. Emission of β- particle results in an increase in its atomic number by 1 while its atomic weight remains unaffected. If you think this study Material is Useful, Please Get It Legally from the publishers. This course is usually taught for students who just have finished the Phys.131 and 132 (Introductory Physics) in the SUNY at Binghamton. Blog |
“Modern” physics means physics based on the two major breakthroughs of the early the twentieth century: relativity and quantum mechanics. Refund Policy, Register and Get Free access of Online Study Material, Please choose a valid
Download Modern Physics- I NOTES by MOTION for Jee Mains & Jee Advanced (IIT JEE) exam preparation. (a) Presence of current for zero value potential indicates that the electrons are ejected from the surface of emitter with some energy. ,
French scientist Pierre Laplace even suggested that if we had such information for every particle in the universe we could know everything about the universe, including how it began, and how it would end. Today, we are sharing Modern Physics Notes PDF. Contact Us |
(a) Stopping potentialdepends upon thefrequency of light. Since, W∝1/n2, a higher orbit electron possesses a lesser negative energy (greater energy) than that of a lower orbit electron. It has data for preparation for the exam in a proper sequence. Emission of γ- rays results neither in a change of atomic number nor in a change of atomic weight. (b) For a particular element (Z= constant), orbital velocity of the electron varies inversely as the order of the orbit. Modern Physics Notes are very important for any competitive exam and this Modern Physics Notes PDF. Work function:- It is defined as the minimum energy required to pull an electron out from the surface of metal. Pay Now |
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For, C.G.S system (k = 1), r = n2h2/4π2mZe2. If your intention is to master the concepts of modern physics and you haven’t yet learned classical physics, you absolutely must go back and view that playlist in its entirety. In Phys.131 and 132, we do not teach the modern physics (we teach the simple case of the special relativity).
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