Question

If the mass of 1 proton is 1.673×10-27 kg and a neutron is 1.675×10-27 kg, what is the binding energy of the nucleus?

Answer 1

Answer:

proton mass, mp = 1.673 × 10-27 kg

neutron mass, mn = 1.675 × 10-27 kg

mass of a 42He nucleus = 6.643 × 10-27 kg

The mass of a 42He nucleus is less than the sum of the masses of its parts; this is true for all nuclides. So much for conservation of mass.

Introduce the atomic mass unit (amu, or u) as a convenient unit of nuclear mass. 1 amu or 1 u, which is

1

12

the mass of a neutral 126C atom (i.e. including its six electrons):

u = 1.66056 × 10-27 kg.

Thus:

mp = 1.0073 u

mn = 1.0087 u

me = 0.00055 u

mass of a neutral

42He

atom = 4.0026 u

Explanation:

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