Question

The original amount of a radioactive sample should be multiplied by which expression to calculate the amount of the sample that remains after n half-lives have passed? (one half) times n. (startfraction 1 over n endfraction) squared. (one half) superscript n. startfraction 1 over (2 n) endfraction.

Answer 1

The original amount of a radioactive sample should be multiplied by (one half) superscript n to calculate the amount remaining.

What is half-life?

This is the time taken for half a substance to decay.

Description of number of half-lives

The number of half-lives a substance has undergone is related to its original amount as and amount remaining according to the following equation:

N = N₀ × (½)ⁿ

Where

• N is the amount remaining
• N₀ is the Original amount
• n is the Number of half-lives

From the above equation, we can conclude that the original amount of a radioactive sample should be multiplied by (one half) superscript n

to calculate the amount remaining.

Learn more about half life:

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