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Q.

Two deuterium nuclei each of mass ‘m’, fuse together to form a Helium nucleus, releasing and energy E. If ‘c’ is the velocity of light, the mass of Helium nucleus formed will be :

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a

2m+Ec2

b

m+Ec2

c

Emc2

d

2m−Ec2

answer is D.

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Detailed Solution

21H2→2He4+E;∴E=2mc2−Mc2Mc2=2mc2−E;∴M=2m−Ec2

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