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Question
When radiation energy is absorbed by a spin 1/2 nucleus in a magnetic field, what happens?
Options:
A .  The processional frequency of the nucleus increases
B .  The nucleus spins faster
C .  The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
D .  none of the above
Answer: Option C
Answer: (c).The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field

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