Question

Half life of radioactive element is t. What is the half life if it reduce to 3.125% of initial

Answer 1

If the time is t

And the initial mass is 100%

So , the decays decrease

100÷2 = 50%

50÷2=25%

25÷2=12.5%

12.5÷2=6.25%

6.25÷2= 3.125%

t1/2 = t/5

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