PhysicsHardHigh School (11–12)Modern Physics › Atoms and Atomic SpectraJEE MainNEETAEEE (Amrita)AMUEEEAP EAPCETBCECE
Created by StemPy LabIn a scattering experiment, an alpha particle of kinetic energy and, separately, a proton of kinetic energy are fired from far away straight at the same heavy nucleus, which stays at rest. Each particle stops for an instant at its distance of closest approach, where all its kinetic energy has become electric potential energy. Treat the nucleus as a point charge. What is the ratio of the distance of closest approach of the alpha particle to that of the proton?
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← In the figure, electrons accelerated through 54 V strike a nickel crystal along the normal. The strongest scattered beam leaves at 50° to the normal. It comes from the first order diffraction by the rows of atoms on the surface, spaced D apart, so that D sinφ = λ. The accelerating voltage is raised to 216 V. At what angle to the normal does the strongest first order beam now leave?The figure shows four jumps of the electron in a hydrogen atom. A, B and C emit a photon, and D absorbs one. Match each jump with its description.
List-I (Jump)
A. Jump A
B. Jump B
C. Jump C
D. Jump D
List-II (Description)
I. Takes in a photon
II. Emits the shortest wavelength of A, B and C
III. Emits a Balmer line
IV. Emits the longest wavelength of A, B and C →
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