Question

The half-life of a radioactive kind of tellurium is 2 months. If you start with 6,576 grams of it, how much will be left after 6 months?

Answer 1

After 2 months, the initial amount will decay by half.

Then, 6,576 * 1/2 = 3,288

After 2 months, will decay by half again:

3,288 *1/2 = 1,644

And finally, after 2 more months;

1,644 * 1/2 = 822

The amount of grams left over 67 months is 822 grams.