1.

The mass of an a-particle is                                [CBSE PMT 1992]

A.            Less than the sum of masses of two protons and two neutrons     
B.            Equal to mass of four protons
C.            Equal to mass of four neutrons                                       .
D.            Equal to sum of masses of two protons and two neutrons
Answer» B.            Equal to mass of four protons


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