The classical atom model of Rutherford could not explain the atomic structure because the atom was unstable on account of continuous emission of energy by the orbiting electron. Class 12 Physics Chapter 12 Atoms Session 2024-2025.
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Rutherford’s atom is an electrically neutral sphere consisting of a very small, massive and positively charged nucleus at the centre surrounded by revolving electrons in their respective orbits. The electrostatic force provides the requisite centripetal force. Class 12 Physics Chapter ...
Impact parameter (b) is the perpendicular distance of the velocity vector of the alpha-particle from the central line of nucleus, when the particle is far away from the nucleus. Class 12 Physics Chapter 12 Atoms Session 2024-2025.
It is the distance from nucleus at which an energetic a-particles approaching directly towards the nucleus, retraces its path through 180°. At distance of closest approach speed of a-particle is zero. Class 12 Physics Chapter 12 Atoms Session 2024-2025.
From large angle scattering of a-particles we conclude that almost whole mass and whole positive charge of the atom is concentrated in a tiny space, called nucleus, at the centre of atom. Class 12 Physics Chapter 12 Atoms Session 2024-2025.
No, most electrons get scattered into the metal. Only a few come out of the surface of the metal. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.
(i) No, (ii) Yes, increases on increasing the frequency of incident light. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.
To cause photoelectric emission from a metal surface, a minimum amount of energy is required to eject electron. Therefore, frequency of incident radiation must be equal to or greater than a minimum frequency. Class 12 Physics Chapter 11 Dual Nature ...
(i) No electron will be emitted when illuminated by red light. (ii) Electron emission takes place with blue light. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.
As stopping potential Vo = 1.5 V, hence maximum kinetic energy of the photoelectrons emitted Kmax = 1.5 eV. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.