DP Physics (first assessment 2025)

Question 23M.2.HL.TZ1.5diii

iii.

[Maximum mark: 2]

23M.2.HL.TZ1.5diii

(iii)

Estimate the fraction of tritium remaining after one year.

[2]

Markscheme

$λ$ = « $\frac{\ln 2}{12.3}$ »0.056«y⁻¹» OR $0 . 5^{\frac{1}{12.3}}$ OR $e^{- 1 \times \frac{\ln 2}{12.3}}$

0.945 OR 94.5% ✓

Allow ECF from MP1

Syllabus sections