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)=0.39MeV which is both K.E and mass×c2 Hence, mass×c2≤0.39MeV