Please help! Physics assignment on radioactivity.?
Calculate the weight of 10 mCi of 14C. Half life is 5760 years.?
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answers:
Steve4Physics say: Convert the activity (A) from mCi to Bq using 1mCi = 3.7x10^7 Bq.
Convert half life (t_half) to seconds (using 1 year = 365x24x3600s).
Calculate decay constant λ = ln(2)/t_half
Number of atoms = N. Then since A = λN we find the number of atoms:
N = A/λ
Find mass of each atom (m) using m = 14u where u is atomic mass unit:1u = 1.66x10^-26kg.
Mass = mN
The question probably wants you to find the mass (not weight). But if you want the weight (in newtons) multiply mass by g (=9.8m/s^2).
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Steve4Physics say: Convert the activity (A) from mCi to Bq using 1mCi = 3.7x10^7 Bq.
Convert half life (t_half) to seconds (using 1 year = 365x24x3600s).
Calculate decay constant λ = ln(2)/t_half
Number of atoms = N. Then since A = λN we find the number of atoms:
N = A/λ
Find mass of each atom (m) using m = 14u where u is atomic mass unit:1u = 1.66x10^-26kg.
Mass = mN
The question probably wants you to find the mass (not weight). But if you want the weight (in newtons) multiply mass by g (=9.8m/s^2).
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