A first-order radioactive decay yields the table below.
What is the half-life and rate constant?
- A
t₁/₂ = 10 min, k = 6.93 min⁻¹
- B
t₁/₂ = 5 min, k = 0.14 min⁻¹
- C
t₁/₂ = 20 min, k = 0.035 min⁻¹
- Dcheck_circle
t₁/₂ = 10 min, k = 0.069 min⁻¹
Explanation
[A] halves every 10 min ⇒ t₁/₂ = 10 min. k = ln 2 / t₁/₂ = 0.693/10 = 0.0693 min⁻¹.