.
Answer:
Power of lamp, P = 100 W and mass of deuterium
=s 2 kg
From the reaction
given in the exercise, we find that 2 nuclei of 
combine to give 3.2 MeV
of energy.
Now 2 g of is
equivalent to 6-023 x 1023 nuclei
2 kg
of is
equivalent to
nuclei
The
energy released for combination of
6.023 x 1026
nuclei,
Using
or
we
get
years 
years.
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