A. 8 days B. 16 days C. 32 days D.40 days E.48 days.
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Iodine-131 has a half-life of 8 days. How long will it take for a 160 mg sample to decay to 10 mg?
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The half-life of a nuclide is a measure of how long it will take for half of the atoms in the sample to undergo radioactive decay. For example, uranium-238 has a half-life of 4.5 billion years, so if I were to give you a kilogram of U-238, you'd only have 500 grams that hadn't decayed after 4.5 billion years passed.
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Nuclear half-life expresses the time required for half of a sample to undergo radioactive decay. Exponential decay can be expressed mathematically like this: #A(t) = A_0 * (1/2)^(t/t_(1/2))# (1), where. #A(t)# - the amount left after t years; #A_0# - the initial quantity of the substance that will undergo decay; #t_(1/2)# - the half-life of the decaying quantity.
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Questions. 1  Element X has a half-life of 6000 years. 2  Iron-59 has a half-life of 45.1 days. 3  A radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. 4  If a sample is known to be about 10,740 years old has 400 C-14 atoms, how many atoms were in the sample when the organism died? 6 days ago.
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How long will it take 20 mg of iodine-321 to decay to 16.85 mg if the half-life of iodine-131 is 8.1 days? The half-life of iodine-131 is 8.1 days. How long will it take for 3/4 of a sample of iondine to decay?
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Iodine-131 has a half-life of 8.0 days. How many grams of an original 160 mg sample will remain after 40 days? Iodine-131 a half life of 8 days how many days for a .80 mg sample in the thyroid take to decay .10 mg? How long will it take for 75.0% of a 0.00490 mg sample of radioactive iodine-131 to decay? The half-life of io
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8 days 20 mg ---> 10 mg ... 8 days So for 160 mg to 10 mg requires 32 days. <-------------------[C] A check : -------------------------------- - K = [ ln ( 1/2 ) ] / [ t sub 1/2 ] - K = [ln ( 1/2 ) ] / 8 = - 0.08664 ( d )^-1 ln C/ C0 = ( - K ) ( t ) t = [ ln (10/160 )] / [ - 0.08664 ] = 32 days <-------- [ OK ! ]
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how long is iodine half life
An iodine 131 has a half life of 8 days. Iodine 131 has a half life of 8 days.