Asked by Anonymous

You have 480 grams of a radioactive kind of tin. If its half-life is 10 days, how much will be left after 30 days?

Answers

Answered by Bosnian
After 10 days you have half left

After 20 days that's half of the half again = a quarter

After 30 days that's half of a quarter = an eighth


480 / 8 = 60 grams

Answered by Bosnian
Equation :

N( t ) = N( 0 ) * ( 1 / 2 ) ^ [ t / t( 1 / 2) ]

In this case :

N ( 30 ) = 480 * ( 1 / 2 ) ^ ( 30 / 10 )

N ( 30 ) = 480 * ( 1 / 2 ) ^ 3

N ( 30 ) = 480 * 1 / 8 = 60 grams
Answered by Bosnian
Also you can in google type:

half-life equation

and click : en.wikipedia
Answered by Anonymous
Suppose that a certain radioactive substance has a half-life of 20 years. If there are presently 2400 milligrams of the substance, how much, to the nearest milligram, will remain after 70 years?
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