The radioactivity of a certain radioactive elements drops to 164 of its initial value in 30 seconds. Its half-life is

AA0=12n⇒A0/64A0=12t1t1/2=1230 t1/2=5sec

The radioactivity of a certain radioactive elements drops to 164 of its initial value in 30 seconds. Its half-life is

AA0=12n⇒A0/64A0=12t1t1/2=1230 t1/2=5sec

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The radioactivity of a certain radioactive elements drops to $\frac{1}{64}$ of its initial value in 30 seconds. Its half-life is

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$\frac{A}{A_{0}} = \frac{1}{2^{n}} \Rightarrow \frac{A_{0} / 64}{A_{0}} = \frac{1}{2^{t_{1} t_{1 / 2}}} = \frac{1}{2^{30}} t_{1 / 2} = 5 \sec$

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The radioactivity of a certain radioactive elements drops to 164 of its initial value in 30 seconds. Its half-life is

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The radioactivity of a certain radioactive elements drops to $\frac{1}{64}$ of its initial value in 30 seconds. Its half-life is