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A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils. The recoil energy will be
Options
(a) Mc² – hv
(b) h²v² / 2Mc²
(c) zero
(d) hv
Correct Answer:
h²v² / 2Mc²
Explanation:
Momentum Mu = E/c = hv / c
Recoil energy
1/2 Mu² = 1/2 . M²u² / M = 1/2M (hv/c)²
= h²v² / 2Mc²
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Topics: Radioactivity
(83)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When 10¹⁹elecrons are removed from a neutral metal plate through some process,
- When photons of energy hν fall on an aluminium plate (of work function E₀),
- A galvanometer has a resistance 50Ω. A resistance of 5Ω is connected parallel to it.
- The wavelength λₑ of an electron and λₚ of a photon are of same energy E are related by
- The initial rate of increase of current, when a battery of emf 6 V is connected
Topics: Radioactivity (83)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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