Question

radium 226 has a half life of 1600 yers. suppose we have a 300g sample. how much remains after 200 years

Answer 1

`A=275.1g`

Step-by-step explanation:

Hello.

In this case, since the radioactive decay is computed via:

`A=A_0*2^{-(t)/(t_(1/2))`

For the initial amount of Ra-226 (300 g), once 200 years have passed, the remaining mass is:

`A=300g*2^{-(200years)/(1600years)}\\\\A=275.1g`

This is, considering that the half-life is 1600 years, it means that the mass of Ra-226 is decreased.

Best regards.