Multiple Choice
How long does it take light to travel across the width of a Pb nucleus of radius 7.1 fm?
A) 2.4 × 10-23 s
B) 1.2 × 10-23 s
C) 2.4 × 10-20 s
D) 4.7 × 10-23 s
E) None of the above.
Correct Answer:
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