0
What is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days?
Wiki User
∙ 11y ago
1 day
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoMathematically, The half life T 1/2 = (30 x 0.693)/ ln e (40/5) days = 30 x 0.693/ (3 x 0.693)
T1/2 = 10 days
Knowing that the half life is defined as the time for the activity (and correspondingly the material amount) by half.
Since the material is reduced from 40 to 5, it means it was reduced by three halfs (20, 10, 5). Accordingly 30 days = 3 T 1/2 or T 1/2 = 10 days
Jyoti Bhatia
The half-life is 2 days.
Wiki User
∙ 11y ago1
Wiki User
∙ 8y ago1 day
Add your answer:
Earn +20 pts
What is the half-life of a radioisotope if a 40 g sample becomes 10 g after 20 minutes?
10 minutes. APEX ^-^
If on September 1 a school purchased a radioisotope of mass 350 g with a half-life of 45 days how much of the sample would be left on June 1?
Find the number of days (I refuse to futz around with a calendar for you). Divide it by the half-life, in this case 45 days. Raise 0.5 to that power (that's what the xy key on calculators is for). Multiply the resulting number by the original mass (here, 350 g) and there's your answer.
What is the total mass of 222Rn remaining in an original 160-milligram sample of 222Rn after 19.1 days?
5.0 mg is the total mass of 222Rn remaining in an original 160-milligram sample of 222Rn after 19.1 days.
How much of a 100 g sample of thorium 234 will be unchanged after 48.2 days?
After 48,2 days the amount of Th-234 will be 25 g.
How long will it take for a 12.0-g sample of iodine-131 to decay to leave a total of 1.50 g of the isotope The half-life of iodine-131 is 8.07 days?
half life is 8.1 days, so it takes 8.1 days for half the iodine sample to decay. It takes another 8.1 days for half of the remaining sample (ie. 1/4th of the original sample) to decay. So it takes 16.2 days for 3/4th of the sample to decay.
What is the half life of a radioisotope if a 50 sample becomes 25 after 18 days?
18 days
What is the half life of a radioisotope if a g sample becomes 5 g after 2 days?
1
What is the half life of the Radioisotope Ag110?
It is 252 days.
What is the half-life of a radio slope if a 20g sample becomes 5g after 2 days?
1 day
The radioactive decay constant is days-1 if the radioisotope has a half-life of 52 days?
0.013
The radioactive decay constant is days-1 if the radioisotope has a half-life of 431 days?
0.00161
The radioactive decay constant is days-1 if the radioisotope has a half-life of 163 days?
0.00425
How long does Klonopin stay in your in urine?
3-5 days, 18-50 hour halflife
What is the lifetime for neptunium -238?
The halflife is 2.1 days. Multiply that by about 5 to get the time to decay to near zero.10.5 days or so.
The radioactive decay constant is blank days -1 if the radioisotope has a half-life of 52 days?
0.013
What is the half-life of a radioisotope if a 40 g sample becomes 10 g after 20 minutes?
10 minutes. APEX ^-^
What is the half life of the Radioisotope Fe55?
It is 100 years.
