Q27.Assume that a neutron breaks into a proton and an electron. The energy released during this process is (Mass of neutron = 1.6725 × 10−27 kg; mass of proton = 1.6725 × 10−27 kg; mass of electron = 9 × 10−31 kg) (1) 0.73 MeV (2) 7.10 MeV (3) 6.30 MeV (4) 5.4 MeV
What This Question Tests
The question requires calculating the mass defect in the beta decay of a neutron and then converting this mass defect into energy released using Einstein's mass-energy equivalence relation.
Concepts Tested
Formulas Used
ΔE = Δmc²
1 MeV = 1.602 × 10⁻¹³ J
c = 3 × 10⁸ m/s
1 amu = 931.5 MeV/c²
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13.3 A given coin has a mass of 3.0 g. Calculate the nuclear energy that would be required to separate all the neutrons and protons from each other. For simplicity assume that the coin is entirely made of 6329Cu atoms (of mass 62.92960 u).
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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
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📋 Question Details
- Chapter
- Nuclei
- Topic
- Mass-energy equivalence
- Year
- 2012
- Shift
- Offline
- Q Number
- Q27
- Type
- Numerical
- NCERT Ref
- Class 12 Physics Ch 13: Nuclei
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