1.

A radioactive material exhibits an intensity of 3.8 mCi at time 't' & an intensity of 1.35 m Ci five minutes later. Calculate the halflife period of the substance .

Answer»

202.28 SEC
102.28 Sec
3.4 minutes
34 minutes

SOLUTION :`((0.693)/(t_(1//2))) xx 5 = 2.303 LOG ((3.8)/(1.36)) , t_(1//2) = (0.693 xx 5)/(2.303 xx 0.446) = 3.374` min = 3.4 min


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