A radioactive isotope X has a half life of 10 s There are 1000 isotopes which are falling from rest from a height of 500 m When

Question

A radioactive isotope X has a half life of 10 s There are 1000 isotopes which are falling from rest from a height of 500 m When it is at a height of 100 m from the reference plane find the activity of the sample 1 50 3 29 2 39 4 100

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