K40 (half-life=1.3x10E9 years) composes approximately 0.012% of the potassium found in nature. By weight, the human body is approximately 0.35% potassium. Calculate the total radioactivity that results from K40 decay in a 75 kg human.

The equation for radioactive decay is: N(t) = Noe-kt, where No is the initial number of radioactive atoms, N(t) is the number of radioactive atoms left after a time t, and k is the decay constant. The half-life of carbon 14 is about 5730 years.
Radioactive carbon dating makes the assumption that living things absorb carbon 14

1. Discuss in detail, one way in which atomic nuclear decay takes place. What is the significance of atomic nuclear decay? Analyze the societal implications of using this process.
2.What are the various uses of radioactivity in healthcare? What are the future trends in healthcare with respect to the use of radioactivity?

A. Explain how the age of rocks can be determined by radioactivity. Give an example.
b. How can scientists determine the internal structure of the Earth, if the depth of the deepest well is only a tiny fraction of the earth's diameter?

3. The half-life of iodine-131, an isotope used in the treatment of thyroid disorders, is 8.04 d.
(a) If a sample of iodine-131 contains 5.0 1016 nuclei, what is the activity of the sample? Express your answer in curies.
(b) If the half-life of iodine-131 were only one-fifth of its actual value, calculate the factor by wh

I need some help in determining the half-life:
1. A radioactive source has a half life of 74 days and an activity of 370 MBq. what was the activity 30 days ago?
2. A radioactive source has a half life of 60 days. what is the relative activity after one week?
3. An 11- Ci Ir- 192 source is recieved on August 20. Regulator

Remember the nuclear accident at Chernobyl (former Soviet Union - now the territory of Ukraine) in 1986?
A scientist suspects that the food in a nearby ecosystem may have been contaminated with radioactive nitrogen over a period of months.
Which substances in plants and animals could be examined for radioactivity to test

See attached file for the formula.
Q1)
If a radioactive parent isotope decays to produce a stable daughter isotope, what will be the daughter to parent ratio (D/P) after 9 half-lives? You should give your answer as a single number.
Q2)
What is the product of the beta minus decay shown below? Fill in the atomic number, m

Select the three options which are NOT examples of quantities that could be modeled by exponential growth or decay.
Options
A. The number of students registering for named degress at the Open University, if each year there are 5% more than the previous year.
B. The world's reserve of a certain mineral, given that 1000