PhysicsAdvancedHigh School (11–12)Modern Physics › Dual Nature of Radiation and MatterNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabFour statements about photoelectrons and matter waves follow. (i) Light with photon energy ejects electrons from a metal of work function , with a greatest kinetic energy of . (ii) Under light of one frequency, all photoelectrons leave a plate with the same kinetic energy. (iii) Halving the intensity of light of a fixed frequency halves the stopping potential. (iv) Quadrupling the accelerating voltage of an electron halves its de Broglie wavelength. How many of the statements above are correct?
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← Each of four hydrogen-like ions has one electron. Match each jump in List-I with the energy of the photon emitted in List-II. Use 13.6 eV for the ground state energy of hydrogen. List-I (Jump) A. H atom, from n = 4 to n = 2 B. He⁺ ion, from n = 4 to n = 2 C. Li²⁺ ion, from n = 4 to n = 2 D. Be³⁺ ion, from n = 2 to n = 1 List-II (Photon energy) I. 23.0 eV II. 163 eV III. 2.55 eV IV. 10.2 eVIn 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? →
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