an element with initial mass 1 kg started radioactivity in 2021 , in which year the element will lose 0.5 kg ? knowing that the decay constant for element is 693.147*10^-5 / year
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an element with initial mass 1 kg started radioactivity in 2021 ,
in which year the element will lose 0.5 kg ?
knowing that the decay constant for element is 693.147*10^-5 / year
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- What fraction f1 of a radioactive sample will be left after 3 half‑lives? f1 = ? What fraction f2 of a radioactive sample will be left after 8.5 half‑lives? f2 = ?An unknown element X has the following isotopes: ⁶⁴X (49.00% abundant), ⁶⁶X (28.00% abundant), ⁶⁸X (23.00% abundant). What is the average atomic mass in amu of X?Question 4. A syuthetic radioisotope is freshly prepared in a lab that has an ac- tivity of 10.0 mCi. If the activity of the radioisotope changes to 8.00 mCi, in 5.00 h, (a) What is the decay constant and half-life of the radioisotope in seconds? (b) How many atoms of the radioisotope were contained in the freshly prepared sam- ple? (e) What is the sample's activity in mCi 40.0 h after it is prepared?
- Suppose that you want to find out how much gasoline is in an underground storage tank. You pour in 1 gallon of gasoline that contains some radioactive material with a long half-life that gives off 5000 counts per minute. The next day, you remove a gallon from the underground tank and measure its radioactivity to be 10 counts per minute. How much gasoline is in the tank?If the activity of a sample of radioactive material is initially 10 Ci and the half-life of the material is 1.2 hour. What is the activity after 4.2 hours?