CBSE Class 12 Physics — Atoms
All previous year questions from Chapter: Atoms
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2026(2 questions)
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The 'distance of closest approach' of an alpha-particle is 'd' when it moves with a velocity v head-on towards the target nucleus. If the velocity of alpha particle is halved, the new 'distance of closest approach' will be −
1 mark· A· Distance of Closest Approach (Rutherford Scattering) - 16
Assertion (A): In Bohr model of hydrogen atom, the energy levels are discrete and quantised. Reason (R): In a hydrogen atom, the electrostatic force on the electron provides the necessary centripetal force to it to revolve around the nucleus.
1 mark· A· Bohr model — energy quantisation