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ahrayia [7]
3 years ago
13

If the half-life of a radioactive substances is 590 million years and you have 40 atoms of it, how many half-lives will have pas

sed when 5 atoms remain
Chemistry
1 answer:
Nady [450]3 years ago
3 0

Answer:

3

Explanation:

Applying,

2^{n'} = R/R'............... Equation 1

Where n' = number of halflives that have passed, R = Original atom of the substance, R' = atom of the substance left after decay.

From the question,

Given: R = 40 atoms, R' = 5 atoms

Substitute these values into equation 1

2^{n'} = 40/5

2^{n'} = 8

2^{n'} = 2³

Equation the base,

n' = 3

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