Nuclear Power Engineering
The disintegration rate of a radioactive element

Remains constant throughout
Progressively decreases
Progressively increases
May increase or decrease depending on the material

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Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

The fuel required (e.g. deuterium and tritium) is scarce
Quantity of fuel required for initiating fusion reaction is prohibitively high
It is difficult to initiate fusion reaction
It is difficult to control fusion reaction

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