Activity A $($continued from previous page$)$

$4.$ Collect data: Click Reset. Change the Malf$-$life to $10$ seconds and click Play. Select the TABLE tab and record the number of radioactive atoms at each given time below.

s: Os: $10s20$ s: $30s$: $40s50$

$5.$ Analyze: What pattern, if any, do you see in your data?

$6.$ Revise and repeat: Use your data from #$4$ above to fill in the first line of the data table below. Then repeat the experiment four more times. Calculate the average number of radioactive atoms for each time.

$\backslash$table$[[$Trial$,0s,10s,20s,30s,40s,50s$