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The masses of neutron and proton are 1.0...

The masses of neutron and proton are `1.0087` a.m.u. and `1.0073` a.m.u. respectively. If the neutrons and protons combine to form a helium nucleus (alpha particle) of mass `4.0015`a.m.u. The binding energy of the helium nucleus will be `(1 a.m.u. = 931 MeV)`.

A

`28.4MeV`

B

`20.8MeV`

C

`27.1MeV`

D

`14.2MeV`

Text Solution

Verified by Experts

The correct Answer is:
A
`2_(0)n^(1) +2_(1)p^(1)rarr_(2)He^(4)`
Mass defect: `Deltam = (2xx1.0087 +2xx1.0073-4.0015)`
`= 0.0305 "amu"`
`B.E. = 0.0305 xx 931 = 28.4MeV`
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