A researcher recorded the radiation count rate of a radioactive source with a known half-life of exactly $minutes10.0\text{ minutes}$ . The measurements are shown in the table below:

Time ( $minutes\text{minutes}$ )	Count rate ( $minute\text{counts per minute}$ )
$0$	$520$
$10.0$	$270$
$20.0$	$145$
$30.0$	$82.5$

State why each measured count rate is always greater than half of the previous value.

Calculate the constant level of background radiation, in $minute\text{counts per minute}$ , present during this experiment.

A researcher recorded the radiation count rate of a radioactive source with a known half-life of exactly $minutes10.0\text{ minutes}$ . The measurements are shown in the table below:

Time ( $minutes\text{minutes}$ )	Count rate ( $minute\text{counts per minute}$ )
$0$	$520$
$10.0$	$270$
$20.0$	$145$
$30.0$	$82.5$

State why each measured count rate is always greater than half of the previous value.

Calculate the constant level of background radiation, in $minute\text{counts per minute}$ , present during this experiment.

5.2 Radioactivity

Question 109

Markscheme

5.2 Radioactivity

Question 109

Markscheme

5.2 Radioactivity

Question 109

5.2 Radioactivity Questions

5.2 Radioactivity

Question 109

5.2 Radioactivity Questions