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Q.

A 7Li target is bombarded with a proton beam current of 10-4 A for 1 hour to produce.  7Be of activity 1.8 x 108 disintegrations per second.  Assuming that one 7Be radioactive nucleus is produced by bombarding 1000 protons.  Half life of 7Be is ………….. (approx.)

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a

6.63 x 106 sec

b

7.63 x 106 sec

c

8.63 x 106 sec

d

9.63 x 106 sec

answer is C.

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A 7Li target is bombarded with a proton beam current of 10-4 A for 1 hour to produce.  7Be of activity 1.8 x 108 disintegrations per second.  Assuming that one 7Be radioactive nucleus is produced by bombarding 1000 protons.  Half life of 7Be is ………….. (approx.)