Radiocarbon Questions -- Page 2 of 12

Page 2 of 12

3.	Of the three isotopes of carbon, which is most abundant and which is radioactive?
	C-12 & C-13
	C-13 & C-14
	C-14 & C-12
	C-12 & C-14
	no way to know
4.	Generated in the upper atmosphere, C-14 makes up only 0.00000000010% of all carbon atoms. This is the same as 1 atom of C-14 per every____ atoms of Carbon.
	1 thousand
	1 million
	1 Billion
	1000 Billion or 1 Trillion
	no way to know