1. If the diameter of the hydrogen atom is scaling up to the 400 m track playground, what would
the size of its nucleus be?
Hint: Radius of hydrogen is 0.053 nano meter. Radius of its nucleus is 0.85 femto meter.
(A) a few-mm sand grain
(B) a ping-pong ball
(C) a base ball
(D) a bowling ball
(E) a basketball
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