00:02The question is half-life of radon is 382 days, how much of 100 gram sample of radon
00:13would be left after 764 days?
00:19First of all, we will make a data is half-life of radon is obtained as 382 days, mass
00:47of radon sample is obtained as 100 gram.
01:03We have to find mass of radon left.
01:18So for solution, we will use a formula.
01:26First of all, we will find number of half-lives, so number of half-lives will be calculated
01:41by using formula, total period divided by half-life.
02:00So, number of half-lives in the given periods will be is total period is obtained as 764
02:26days, so 764 days divided by half-life which is 382 days.
02:37So 764 divided by 382, it will be obtained as 2.
02:44So, number of half-lives in the given period are 2.
02:50Now finally, we will find mass of radon left.
03:05So, it will be calculated by using formula, mass of radioactive sample means mass of radon divided
03:18divided by 2.
03:23So, mass of radon divided by 2.
03:24So, mass of radon divided by 2.
03:48radon is obtained as 100 gram, so 100 divided by 2 power number of half lives are 2, so
04:00power 2 it will be 100 upon the square of 2 is 4, so mass of radon left will be
04:16obtained
04:17is 25 gram.
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