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A .^7Li target is bombarded with a proto...

A `.^7Li` target is bombarded with a proton beam current of `10^-4` A for `1` hour to produce `.^7 Be` of activity `1.8xx10^8` disintegrations per second.
Assuming that `.^7Be` radioactive nucleus is produced by bombarding `1000` protons, determine its half-life.

A

100 days

B

110 days

C

150 days

D

80 days

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The correct Answer is:
A
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