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Question

Assuming the table contains no major errors, what can we conclude about the (mass×c2) of the undetected third particle?

A
It is 0.79MeV.
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B
It is 0.39MeV.
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C
It is less than or equal to 0.79MeV; but we cannot be more precise.
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D
It is less than or equal to 0.39MeV; but we cannot be more precise.
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Solution

The correct option is D It is less than or equal to 0.39MeV; but we cannot be more precise.
Total energy of the particle is 940.97(939.67+0.51+0.39+0.01)=0.39 MeV
which is both K.E and mass×c2
Hence, mass×c2 0.39 MeV

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