A radioactive substance decays |NUCLEAR PHYSICS|JEEMAIN 2021

JEE MAIN 2021

20-07-21 S2

Question

A radioactive substance decays to $\left(\frac{1}{16}\right)^{\text {th }}$ of its initial activity in 80 days. The half life of the radioactive substance expressed in days is $\_\_\_\_$ .

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Solution

N₀ ──t₁⁄₂──> N₀/2 ──t₁⁄₂──> N₀/4 ──t₁⁄₂──> N₀/8 ──t₁⁄₂──> N₀/16 4 × t₁⁄₂ = 80 t₁⁄₂ = 20 days

Question Tags

JEE Main

Physics

Easy

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