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This question is about nuclear fusion.

The incomplete nuclear equation shows the fusion of two isotopes of hydrogen.

{ }_{1}^{2} \mathrm{H}+{ }_{1}^{3} \mathrm{H} \rightarrow{ }_{2}^{4} \mathrm{He}+\mathrm{X}

Each fusion reaction releases approximately 3 x 10^-12 J of energy.

Estimate how many reactions are needed to produce 1 J of energy.
Give your answer to 1 significant figure.

number of reactions = ............

Marking points:
- correct evaluation
- given to 1 significant figure

Example:
$\text{number}=3.3\ldots\times10^{11}$ $\text{number}=3\times10^{11}$

Marking guidance:
- marks are independent

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Edexcel IGCSE Physics 1d Estimate Simple Calculations Topic Practice

1D Estimate simple calculations question 1