Question

a radioactive material is undergoing nuclear decay. After 40 minutes, 25% of the sample remains. What is the half-life of the sample
This is the long way but I would do this.
ln(No/N) = kt
Substitute
No = 100 (just make up any number)
N = 25 (25% of whatever you picked for No)
k = solve for this
t = 40 minutes.

Then substitute k into
k = 0.693/t<sub>1/2</sub> and solve for t<sub>1/2</sub>.

Related Questions

a radioactive material is undergoin nuclear decay. After 40 minutes, 25% of the sample remains. What... Assume a sample of material must undergo a single radioactive decay process (beta decay for example)... Radioactive materials are radioactive because their nuclear unstable and unstable nucleus can become... what questions can u ask form this passage, Radioactive materials are radioactive because their nucl...