# chemistry

If there is a radiation that has a half life of 10 days and we have it for 110 days, what will be the fraction of radiation left?

1. 👍 0
2. 👎 0
3. 👁 44
1. k = 0.693/10 days.
Substitute into the expression below.
ln(No/N) = kt.
Solve for No/N and take the reciprocal. You want N/No.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### CALC -- integrals!

Iodine-131 is used to treat hypo-thyroidism since it is preferentially absorbed by the thyroid and typically involves a total radiation dosage of 10,000,000 millirem. Iodine-131 has a half-life of eight days. 1. Set up the

asked by anonymous on February 4, 2008

Iodine-131 is used to treat hypo-thyroidism since it is preferentially absorbed by the thyroid and typically involves a total radiation dosage of 10,000,000 millirem. Iodine-131 has a half-life of eight days. 1. Set up the

asked by anonymous on February 5, 2008
3. ### Chemistry

If there is a radiation that has a half life of 10 days and we have it for 110 days, what will be the fraction of radiation left?

asked by Jennifer on November 6, 2011
4. ### chemistry

Some radioactive nuclides have very short half-lives, for example, I-31 has a half-life of approximately 8 days. Pu-234, by comparison has a half-life of 24,000 years. Explain why both of these examples are dangerous, even though

asked by kenzie on June 7, 2018
5. ### physics

If the physical half-life of sulfur-35 is 87.1 days, and the biologic half-life in the testicle is 632 days, what is its effective half-life in this organ? I know i have to find the time and then the half-life. But im having

asked by Sarah on October 24, 2013
6. ### half-life

1. The half-life of a first-order reaction is 9.89 minutes. How many minutes will have elapsed after 27 half-lives? My answer is 267.03. 2. The half-life of a second-order reaction is 2.508 days. How many days will have elapsed

asked by Issac on February 7, 2007
7. ### Chemistry

When is an isotope considered stable? _(Select all that apply.)_ The isotope does not emit a form of radiation. The isotope’s half-life is longer than the average human life. The isotope emits some form of radiation. The

asked by Quinn on October 22, 2018

A radioactive isotope, used in the agricultural industry has a half life of 8 days. On application, the radiation is emitted is measured at 12500 counts per sec (cps). If the area that it is applied to cannot be used until the

asked by Manu on January 26, 2013
9. ### Gen Chem

Neptunium-239 has a half-life of 2.35 days. How many days must elapse for a sample of 239-Np to decay to 1.00% of its original quantity? I got: close to 15 days. Is this right? I figured that about 1% of the original quantity

asked by Sarah H on March 28, 2008
10. ### chemistry

How do you find the half-life of an element? Please explain and show me how to do this. I know the answer is 14.3 days, but I don't know how to work it. thank you! the problem is: After 42 days, a 2.0-g sample of phosphous-32

asked by Ryan on December 13, 2007

More Similar Questions