ramos was falling through the air of 30feet per second. how many feet did ramos fall in the 110 seconds before she opened her parachute?
IF 80mg of a radioactive element decays to 10mg in 30 minutes, the half-life of this element is a.10 min b.20 min c.30 min d.40 min the answer is a.10 min but i would like to know why, please help.
which of the following 10 g samples will decay the most in 28 days? a.P-32 b.Kr-85 c.Fr-220 I-131 the answer is c.Fr-220 but i want to know why, please help
A unknown piece of metal is placed into a container of acid. Hydrogen gas was produced as a result. The unknown metal could have been ? Ti is the answer, but I don't understand why.
which of the following 10 g samples will decay the most in 28 days? P-32 Kr-85 Fr-220 I-131
Turn "theta = 2" into rectangular form.
K-42 has a half-life of 12.4 hours. If you begin with 250g of K-42, determine how much you will have left after 4 half-lives. How long does 4 half-lives take? please help
radiated food can be safely stored for a longer time because radiation 1. prevents air oxidation 2. prevents air reduction 3. kills bacteria 4. causes bacteria to mutate is it 3 ?
which isotope can be used as a tracer to study the age of organic material ? 1 C-12 2 C-14 3 Tc-99 4 U-238
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