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Q)

A 300 gm radioactive sample has a half life 3 hrs after 18 hrs remaining qu

A 300 gm radioactive sample has a half life 3 hrs after 18 hrs remaining quantjty

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A)
<div class="clay6-step-odd"><div class="clay6-basic" id="pr10">Amount left after 18hrs = Initial amount x (12)No of half lives</div><div class="clay6-basic" id="pr11">Number of Half Lives $= \large\frac{18}{3}$$=6$</div><div class="clay6-basic" id="pr12">Hence Amount left $ = (300 \times \large\frac{1}{2}) ^6$</div><div class="clay6-basic" id="pr13">$\qquad= 300 \times \large\frac{1}{64}$$=4.68\;g$</div></div>
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