at 9.00 am the activity of a radioactive sample was 1,200 cpm . At 1.00pm the activity was only 150 cpm. what is half life of the sample?
at 9.00 am the activity of a radioactive sample was 1,200 cpm . At 1.00pm the...
-11 points SHIPPS14 10..018. What is the half-life of a radioactive isotope If the activity of a sample drops from 6,560 cpm to 205 cpm in 24.0 min? min Need Help? Read It
41. | An investigator collects a sample of a radioactive isotope with an activity of 370,000 Bq. 48 hours later, the activity is 120,000 Bg. What is the half-life of the sample? 207 . 1 22
A sample of a certain radioactive substance is prepared, and its initial activity is 4 µCi. After 2.4 hours, the activity is measured to be 1 µCi. What is the half-life of this material?
After 1.96 days, the activity of a sample of an unknown type radioactive material has decreased to 91.2% of the initial activity. What is the half-life of this material?
A sample of radioactive material contains 1.1E15 atoms and has
an activity of 6.3E11 Bq. What is its half-life?
A sample of radioactive material contains 1.1 x 1015 atoms and has an activity of 6.3 x 1011 Bq. What is its half-life? 1.16E3 X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to...
A) You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 48.2 minutes , what is the half-life of this substance? B) An unknown radioactive substance has a half-life of 3.20 hours . If 24.3 g of the substance is currently present, what mass A0 was present 8.00 hours ago? C) Americium-241 is used in some smoke detectors....
A radioactive sample has an initial activity of 400 decays/s. Its activity 22 hours later is 25 decays/s. What is its half-life Can you show how you do this. thank you
Q13B.12 A sample of a certain radioactive isotope has an activity that we observe to decrease by a factor of 47 dur- ing a year. What is the isotope's half-life?
a) You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 76.2 minutes , what is the half-life of this substance? b)An unknown radioactive substance has a half-life of 3.20 hours . If 14.6 g of the substance is currently present, what mass A0 was present 8.00 hours ago? c) Americium-241 is used in some smoke detectors. It...
A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 3.80 h, the activity is 8.30 mCi. (a) Find the decay constant and half-life of the isotope. (b) How many atoms of the isotope were contained in the freshly prepared sample? (c) What is the sample's activity 30 h after it is prepared?