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Questions  

A star converts all of its He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is

mass of He is 4.0026amu and mass of oxygen is 15.994 amu

a
7.26 MeV
b
7 MeV
c
10.24 MeV
d
23.9 MeV

detailed solution

Correct option is C

Mass defect =4×4⋅0026−15⋅994=0⋅011E=Δmc2=0⋅011×931=10⋅24MeVSo, energy released by oxygen nuclei is 10 .24 MeV.

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What is the total energy emitted for given fission reaction

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The daughter nuclei are unstable therefore they decay into stable end products M 4298o and X 54136e by successive emission of β-particles. Let mass of   01n=1.0087 amu, mass of  92235U=236.0526 amu, mass of  54136Xe=135.9170 amu, mass of M 4298o = 97.9054 


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