Answer
Please see the work below.
Work Step by Step
We can find the ratio of diameters as follows:
$ratio=\frac{D_{hydrogen}}{D_{proton}}$
$ratio=\frac{0.1nm}{1fm}=\frac{0.1\times 10^{-9}m}{1\times 10^{-15}m}=1\times 10^5$
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