Question

Half life of an element is 25 years, then what percentage of sample will be left over after 125 years and its life time are?​

Answer 1

Answer:

Life Time -

100% Reaction

time is infinite

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Answer 2

$N=3.125\%$

Explanation:

Given:

half life of the element, $t_h=25\ yrs$

total time after which the observation is taken, $t=125\ yrs$

Now the quantity of element remaining after 125 years:

$N=N_o\times (\frac{1}{2} )^{\frac{t}{t_h} }$

where;

N = observed quantity of element after the given time t

$N_o=$ initial quantity of element

Since we have to find the remaining percentage of element so we take the initial quantity to be 100.

$N=100\times (\frac{1}{2} )^{(\frac{125}{25})}$

$N=3.125\%$

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TOPIC: radioactive decay

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