What is the density of the nucleus of 90Sr?
A) greater than 3 × 1020 kg/ m3 m3
B) 90 kg/ m3
C) 2.1 × 1019 kg/ m3
D) 2.0 × 1015 kg/ m3
E) 2.3 × 1017 kg/ m3
Correct Answer:
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