(A) : Atomic energy level spacings are of the order of eV, while the difference in nuclear energy levels is of the order of MeV.
(R) : Any nuclear reaction obeys all conservation laws.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true and (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is B.

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Detailed Solution

Atomic energy level spacings are according to Bohr's model which is based on Coulombic force while nuclear energy levels are based on strong nuclear force which are effective in short distance.

Strong nuclear force is strongest and coulombic force is weaker force, so atomic energy level spacings are of the order of eV, while the difference in nuclear energy levels is of the order of MeV.

Any nuclear reaction obeys all conservation laws. viz, energy, mass, momentum, charge conservation.

Both (A) and (R) are true and (R) is not the correct explanation of (A).

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