Q19.A nucleus of mass M emits γ -ray photon of frequency v. The loss of internal energy by the nucleus is: [Take c as the speed of electromagnetic wave] (1) hv (2) 0 (3) hv[1 − 2Mc2hv ] (4) hv[1 + 2Mc2hv ]
What This Question Tests
This question explores the conservation of momentum and energy during gamma decay, accounting for the recoil kinetic energy of the nucleus when it emits a photon, leading to a total loss of internal energy.
Concepts Tested
Formulas Used
E_photon = hv
p_photon = E_photon/c
p_nucleus = p_photon
KE_nucleus = p_nucleus²/ (2M)
Loss of internal energy = E_photon + KE_nucleus
📚 NCERT Sections This Tests
13.5 — The Q Value Of A Nuclear Reaction A + B ® C + D Is Defined By
Physics Class 12 · Chapter 13
13.5 The Q value of a nuclear reaction A + b ® C + d is defined by Q = [ mA + mb – mC – md]c2 where the masses refer to the respective nuclei. Determine from the given data the Q-value of the following reactions and state whether the reactions are exothermic or endothermic. (i) 11 H+13 H →12 H+12 H (ii) 126 C+126 C →1020 Ne+ 24 He Atomic masses are given to be m ( 12 H ) = 2.014102 u m ( 13 H) = 3.016049 u m ( 126 C ) = 12.000000 u m ( 1020 Ne ) = 19.992439 u
11.3 — The Photoelectric Cut-Off Voltage In A Certain Experiment Is 1.5 V.
Physics Class 12 · Chapter 11
11.3 The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted?
12.5 — A Hydrogen Atom Initially In The Ground Level Absorbs A Photon,
Physics Class 12 · Chapter 12
12.5 A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.
📋 Question Details
- Chapter
- Nuclei
- Topic
- Gamma decay and recoil
- Year
- 2021
- Shift
- 20 Jul Shift 1
- Q Number
- Q19
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 13: Nuclei
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