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I don’t understand this question

A radioactive isotope has a count rate 0f 6400Bq and a half life of 4days. What fractionof the isotope will have decayed after 20 days? What will the count rate now be?
Original post by Yaaay
A radioactive isotope has a count rate 0f 6400Bq and a half life of 4days. What fractionof the isotope will have decayed after 20 days? What will the count rate now be?


What does the half-life mean?
Original post by Muttley79
What does the half-life mean?

The time taken for the radioactivity to halve.
Original post by Dee-Emma
The time taken for the radioactivity to halve.

Yes I know - I was asking the OP -
Original post by mpaprika
half life

I think it's better to give hints ...
Original post by Muttley79
I think it's better to give hints ...

oh, oops - sorry
theres a gcse method and an a level method for this. R u GCSE or A level?
Original post by Sophhhowa
theres a gcse method and an a level method for this. R u GCSE or A level?

Given that 20 is divisible by 4, it's easy. There's no point in using a more complicated approach than the question requires.
Original post by RogerOxon
Given that 20 is divisible by 4, it's easy. There's no point in using a more complicated approach than the question requires.

Yes I suppose but an A level student may benefit from being aware of the other method. However, considering it’s divisible I suspect this is GCSE so ignore me

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