Physics

Problem

Four fusion experiments plan to bring the indicated nucleus pairs to the stated closest‐approach distances. Which experiment will require the highest plasma temperature to initiate fusion? (i)

^2_1\mathrm H

–

^3_1\mathrm H

4.0\,\text{fm}

(ii)

^2_1\mathrm H

–

^3_2\mathrm{He}

3.5\,\text{fm}

(iii)

^3_1\mathrm H

–

^3_1\mathrm H

3.8\,\text{fm}

(iv)

^3_2\mathrm{He}

–

^3_2\mathrm{He}

3.2\,\text{fm}

a) Experiment (ii) b) Experiment (iv) c) Experiment (i) d) Experiment (iii)

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