One microgram of radioactive sodium, ""(...

One microgram of radioactive sodium, `""_(11)^(24)Na` with half life of 15 hour was injected into a living system. How long will it take for the radioactivity to fall to 25% of the initial value ?

A

22.5 hr

B

3.75 hr

C

30 hr

D

60 hr

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The correct Answer is:

C

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