Fission fragments have higher binding energy per nucleon than the heavy parent nucleus, which is why energy is released, so option A is correct.

Neutrons experience the strong (nuclear) force and, very weakly, gravity; electrostatic forces do not act on neutral neutrons, so option C is correct.

Radio waves, γ-rays and EM waves are electromagnetic and travel at light speed; α-particles are massive and travel much slower.

Old salt mines are chosen for waste storage because they are very dry and deep underground, so both (B) and (C) is correct.

In Bohr theory energy depends only on n (∝1/n^2) and on μ, not on l(l+1); thus statement A is not true.

The primary distinction is their origin: γ-rays originate in the nucleus, whereas X-rays arise from electronic transitions or deceleration of electrons.

The block header contains an answer hint indicating option A; the output uses the provided OCR answer key metadata.

If the commutator [A,B] is zero, the operators commute, so 'Commute' is correct.

The n=1 shell holds 2 electrons and n=2 holds 8, so a filled n=1 and n=2 total 10 electrons.

In helium both electrons occupy the same lowest orbital but with opposite spins, as indicated by the answer key.