A fossilized animal that was killed by a volcano eruption has 12.5 percent of its original amount of carbon-14 remaining; this radioisotope has a half-life of 5730 years. How long ago did the volcano erupt?

34,380 years ago

22,920 years ago

17,190 years ago

9,168 years ago

If an atom of thorium-234 were to undergo beta emission twice, which atom would result?

An atom of uranium-238 undergoes radioactive decay to form an atom of thorium-234. Which type of nuclear decay has occurred?

Question

A fossilized animal that was killed by a volcano eruption has 12.5 percent of its original amount of carbon-14 remaining; this radioisotope has a half-life of 5730 years. How long ago did the volcano erupt?
 	
	
34,380 years ago
	
22,920 years ago
	
17,190 years ago
	
9,168 years ago

If an atom of thorium-234 were to undergo beta emission twice, which atom would result?

	
An atom of uranium-238 undergoes radioactive decay to form an atom of thorium-234. Which type of nuclear decay has occurred?