In the Geiger-Marsden scattering experiment,the thickness of the thin gold foil is . . . . . . m.
- A$5.5 \times 10^{-7}$
- B$4.2 \times 10^{-7}$
- C$2.1 \times 10^{-7}$
- D$6.2 \times 10^{-7}$
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