Posted by **Sandhya** on Friday, April 18, 2008 at 9:16pm.

1) The number of radioactive nuclei in a particular sample decreases over a period of 15 days to one-seventeenth the original number. What is the half-life (in days) of these nuclei?

2) What is the activity of a sample of 14C that contains 1.22E+21 nuclei?

## Answer this Question

## Related Questions

- physics - The number of radioactive nuclei present at the start of an experiment...
- phys - Although most natural potassium nuclei are stable 39K (93.3%) or 41K (6....
- calc - The half-life of polonium is 139 days, but your sample will not be useful...
- Physics ... - 116In nuclei are produced at the rate of 10 s-1. Calculate the ...
- physics - Radioactive nuclei are produced in an irradiated sample at the rate of...
- physics - 116In nuclei are produced at the rate of 10 s-1. Calculate the ...
- physics - Although most natural potassium nuclei are stable 39K (93.3%) or 41K (...
- science - 116In nuclei are produced at the rate of 10 s-1. Calculate the maximum...
- physics - Suppose 32000 radioactive nuclei are in a sample. About how many ...
- Chemistry - How many half lives will it take for a sample of a radioactive ...

More Related Questions