The half-life for the radioactive decay of U – 238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 17 % of the U – 238 atoms in a sample of U – 238 to decay? Express your answer using two significant figures. ? t = yr Submit Request Answer Part B If a sample of U – 238 initially contained 1.8x1018 atoms and was formed 4.1 billion years ago, how many U – 238 atoms does it contain today? Express your answer using two significant figures. ΑΣφ ? N = atoms

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Can someone please help with question 8a and b

The half-life for the radioactive decay of U – 238 is 4.5 billion years and is independent of initial concentration.
Part A
How long will it take for 17 % of the U – 238 atoms in a sample of U – 238 to decay?
Express your answer using two significant figures.
?
t =
yr
Submit
Request Answer
Part B
If a sample of U – 238 initially contained 1.8x1018 atoms and was formed 4.1 billion years ago, how
U – 238 atoms does it contain today?
ny
Express your answer using two significant figures.
?
N =
atoms
Submit
Request Answer
Transcribed Image Text:The half-life for the radioactive decay of U – 238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 17 % of the U – 238 atoms in a sample of U – 238 to decay? Express your answer using two significant figures. ? t = yr Submit Request Answer Part B If a sample of U – 238 initially contained 1.8x1018 atoms and was formed 4.1 billion years ago, how U – 238 atoms does it contain today? ny Express your answer using two significant figures. ? N = atoms Submit Request Answer
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