免费半衰期计算器
根据半衰期计算物质在给定时间后的剩余量。
剩余
12.5000
Decayed87.5000
Num Halves3.00
Pct Remaining12.50 %
公式
Half-Life Formula
Formula
N(t) = N₀ × (1/2)^(t/t½)
Where:
Properties
计算示例
100 units with a half-life of 5 after 15 time units.
- 01Number of half-lives = 15/5 = 3
- 02Remaining = 100 × (0.5)³
- 03= 100 × 0.125
- 04= 12.5
常见问题
What is half-life?
Half-life is the time required for a quantity to reduce to half of its initial value through decay. It is constant regardless of the starting amount.
Does half-life ever reach zero?
Mathematically, no. The exponential decay function asymptotically approaches zero but never reaches it. In practice, the quantity becomes negligibly small.
What are some real half-lives?
Carbon-14: 5,730 years. Uranium-238: 4.5 billion years. Iodine-131: 8 days. Caffeine in the human body: about 5 hours.
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