A radio active substance has a half life of 20-days

how much time is required so that only 1/32 of the original amount remains?

Find the rate of decay at this time..

Question

A radio active substance has a half life of 20-days

how much time is required so that only 1/32 of the original amount remains?

Find the rate of decay at this time..

anonymous · Answer

2^5 is 32, so it would take 5x20 days, or 100 days.

khally92 · Answer

ok.  what about the rate of decay?

anonymous · Answer

Well every 20 hours it decreases by half.

anonymous · Answer

so however many hours divided by 20 with a negative sign made as the exponent of 2 would give you the answer

anonymous · Answer

for example, 200 hours.  200/20=10  2^-10=1 over 1024