One sixth of the lions are male. how many lions are at the zoo
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The half-life for such a substance is the time required to have the amount (in grams
) at time
(in seconds
),
, decay to half the starting amount
. In other words, for krypton-91, after 10 seconds we would have
. We can use this information to solve for
, then plug in various values of
to find the amount of krypton-91 that's left...
But we don't need to! We already know it takes 10 seconds for half of the substance to decay. So if we start with 16 grams, then after 10 seconds, 8 grams will remain.
10s later (after a total of 20 seconds), 4g will remain.
10s later (30s), 2g will remain.
10s later (40s), 1g will remain.
10s later (50s), 1/2 g will remain.