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Leokris [45]
4 years ago
12

You find a bag labeled "10 kg of lead-210". Its contents now weigh 1.25 kg. How many half-life periods have there been since the

bag was weighed and labeled? Lead-210 is a radioisotope with a half-life of about 22 years.
Physics
1 answer:
zlopas [31]4 years ago
5 0

Answer : The number of half-life periods will be, 3

Explanation :  Given,

Initial amount of lead = 10 kg

Amount of lead after decay = 1.25 kg

Half-life = 22 years

Formula used :

a=\frac{a_o}{2^n}

where,

a = amount of reactant left after n-half lives

a_o = Initial amount of the reactant

n = number of half lives

t_{1/2} = half-life

Now put all the given values in the above formula, we get:

1.25=\frac{10}{2^n}

2^n=8

2^n=2^3

n=3

Thus, the number of half-life periods will be, 3

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