Cara Menghitung Radioactive Decay
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Radioactive decay follows exponential decay law. The decay rate depends on the decay constant and the number of remaining nuclei.
Rumus
The calculator applies N(t) = N₀ × e^(-λt) or A(t) = A₀ × e^(-λt)
- N
- N₀ × e^(-λt) or A(t) = A₀ × e^(-λt) — N₀ × e^(-λt) or A(t) = A₀ × e^(-λt)
- A
- A₀ × e^(-λt) — A₀ × e^(-λt)
Panduan Langkah demi Langkah
- 1Enter initial activity or mass, decay constant (or half-life), and elapsed time
- 2The calculator applies N(t) = N₀ × e^(-λt) or A(t) = A₀ × e^(-λt)
- 3Results show remaining nuclei or activity
Contoh Terpecahkan
Masukan
N₀ = 1 mol (6.022 × 10²³), λ = 0.693/5730 yr⁻¹ (¹⁴C), t = 5730 yr
Hasil
N ≈ 0.5 mol (50%)
One half-life
Kesalahan Umum yang Harus Dihindari
- ✕Using decay constant instead of half-life without converting
- ✕Assuming linear decay instead of exponential
Pertanyaan yang sering diajukan
Can radioactivity be accelerated or stopped?
No, decay rate is determined by nuclear physics and cannot be changed by temperature, pressure, or chemistry.
What's the difference between activity and amount?
Amount is number of nuclei (decreasing exponentially); activity is decay rate (also decreasing, at same rate).
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