and 
are masses of proton and neutron, respectively, at rest. If they combine to form deuterium nucleus. The mass of the nucleus will be:
A
less than 
B
less than 
C
less than 
D
greater than 
Text Solution
Verified by ExpertsThe correct answer is:
B
We know that whenever there is fusion or fission or nucleoids and nuclei. Some mass is lest (mass defect) which converts into energy. So, net mass of products is slightly less than that of initial substances.
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