Discussion
Parity is not conserved in :
Answer: C
Parity is not conserved in weak interactions.
In 1956 T.D. Lee and C.N. Yang pointed out that there was no experimental evidence for parity conservation in weak processes, and in 1957 C.S. Wu's experiment on the beta decay of polarised cobalt-60 showed that it is violated. The weak interaction acts only on left-handed particles (and right-handed antiparticles), so its mirror image is not a possible process.
The strong and electromagnetic interactions conserve parity to high precision, which is why parity is a good quantum number for nuclear and atomic states. Gravity also respects parity, so the weak interaction is the only one of the four that violates it.
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