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a. What factors make a fusion reaction d...

a. What factors make a fusion reaction difficult to achieve ?
b. Why does a fusion reactor produce less radioactive waste than a fission reactor?

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a. Nuclear fission occurs at a high temperature of `10^5 - 10^6K`. It is difficult to attain such a temperature.
b. Whether t is fission or fusion, the product obtained is radio active. For a certain output energy the number of fusion reaction should be corresponding large.
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