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An unknown nucleus has a nuclear density of 2.29 1017 kg/m3 and mass of 19.926 10-27 kg. Its mass number A is approximately : (Take R0 = 1.2 10-15 m, 4π = 12.56)
(3) 12
M = 43 R3 and R3 = R03A
A = 3M4 R03
A = 3 19.926 10-2712.56 (1.2 10-15)3 2.29 1017
A = 5.978 10-2612.56 1.728 10-45 2.29 1017
A = 5.978 10-264.970 10-27
A 12
Answer: (3)
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