1. What is the half-life associated with each of the following decay constants?
ID: 1457677 • Letter: 1
Question
1. What is the half-life associated with each of the following decay constants? (a) 0.523/day; (b) 0.035/second; (c) 1.25/minute.
B) What is the decay constant associated with each of the following half-lives? (a) 8.20 days; (b) 3.4 x 10-3 second; (c) 2.2 minutes.
C) Barium-137m has a half-life of 2.50 minutes. - If a sample of Barium-137m has an initial activity of 2.00 microCuries, what is the activity at… (a) t = 1.00 minute? (b) 2.00 minutes? (c) 8.00 minutes? (d) 15.0 minutes?
D) The decay constant of a radioactive source is 0.150/second. The initial mass of the source is 4.2 micrograms. - What is the mass of the source at t = (a) 0.200 second? (b) 4.80 seconds? (c) 10.0 seconds? (d) 12.0 seconds.
Explanation / Answer
1)
for given decay constant
half life = ln(2)/decay constant
a) decay constant = 0.523 /day
half life = ln(2)/0.523 day
half life = 1.33 days
b)
decay constant = 0.035/second
half life = ln(2)/0.035/second
half life = 19.8 seocnds
c)
decay constant = 01.25 /minute
half life = ln(2)/1.25 /minute
half life = 0.55 minute
2)
now , decay constant = ln(2)/half life
decay constant = ln(2)/8.20 days
decay constant = 0.0845/day
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.