Atomic Structure Question 121

Question: The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number A is given by 1.25×1013×A1/3cm Radius of atom is one \AA . If the mass number is 64, then the fraction of the atomic volume that is occupied by the nucleus is [NCERT 1983]

Options:

A) 1.0×103

B) 5.0×105

C) 2.5×102

D) 1.25×1013

Show Answer

Answer:

Correct Answer: D

Solution:

Radius of nucleus =1.25,×1013×A1/3,cm

=1.25,×1013×641/3

=5×1013,cm Radius of atom = 1{ }AA,=108cm.

Volume of nucleusVolume of atom

=(4/3)π,(5×1013)3(4/3)π,(108)3

=1.25,×1013 .



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