Question text
38 The isotope radon-222 has a half-life of 3.8 days. Which statement about a sample containing 1.0mg of radon-222 is correct? A After 1.9 days there is 0.50mg of radon-222 left. B After 3.8 days there is 0.50mg of radon-222 left. C Its half-life is half that of a 2.0mg sample. D There is no radon-222 left after 7.6 days.
38 The isotope radon-222 has a half-life of 3.8 days.
Which statement about a sample containing 1.0mg of radon-222 is correct?
A After 1.9 days there is 0.50mg of radon-222 left.
B After 3.8 days there is 0.50mg of radon-222 left.
C Its half-life is half that of a 2.0mg sample.
D There is no radon-222 left after 7.6 days.
Select your answer: