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.
Category: Class 12 Physics
NCERT Solutions for Class 12 Physics updated for CBSE academic session 2021-2022.
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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.
In photon picture of light, intensity of radiation is defined as the energy transferred to a surfac unit area per unit time by the photons striking on the surface. Its SI unit is watt/m² (W m²). Class 12 Physics Chapter ...
For a given photosensitive material and with a source of constant frequency v (v > vo) of incident radiation, the photocurrent increases with increase in intensity of incident light. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter ...
Number of photons incident per unit area per unit time on a surface governs the intensity of light Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.