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Q.

If $m_{1}$ is the mass of 2 neutrons +2 protons +2 electrons and $m_{2}$ is the mass of an $α$ -particle +2 electrons, then

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a

$m_{1} > m_{2}$

b

$m_{1} < m_{2}$

c

$m_{1} > may >$ or $< m_{2}$ depending of its physicals state.

d

$m_{1} = m_{2}$

answer is A.

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Detailed Solution

In the formation of $_{2}^{4} He$ from its constituents, there occurs the loss of mass. this is known as mass defect.

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