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Keith_Richards [23]
4 years ago
10

One of the nuclides in spent nuclear fuel is U-235 , an alpha emitter with a half-life of 703 million years.How long will take f

or the amount of U-235 to reach 49.0% of its initial amount?
Chemistry
2 answers:
dimulka [17.4K]4 years ago
5 0

Answer:

The answer is 7.235x10⁸ years

Explanation:

the solution is in the attached Word file

Download docx
Ket [755]4 years ago
3 0

Answer:

683 million years

Explanation:

For radioactive nuclides, the time to decay is given by the expression:

t = -2.303 /k log (A/A₀)

where k is the decay constant and is calculated from the equation:

k = 0.693/ t₁/₂  where ₁/₂ is the half-life.

k = 0693/ 703 x 10⁶ yrs = 9.85 x 10⁻¹⁰ /yr

A = amount after time t

A₀ = amount originally present

Then

t = -2.303 / 9.85 x 10⁻¹⁰ /yr x log (0.51) = 683 x 10⁶ yr

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irina1246 [14]

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Explanation:

Hello!

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