How long does it take light to travel across the width of a Pb nucleus of radius 7.1 fm? A)2.4 $\times$ 10^-23 s B)1.2 $\times$ 10^-23 s C)2.4 $\times$ 10^-20 s D)4.7 $\times$ 10^-23 s E)none of the above

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The Answer of How long does it take light to travel across the width of a Pb nucleus of radius 7.1 fm? A)2.4 $\times$ 10^-23 s B)1.2 $\times$ 10^-23 s C)2.4 $\times$ 10^-20 s D)4.7 $\times$ 10^-23 s E)none of the above

How Long Does It Take Light to Travel Across the Width