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Nuclei question bank (Physics)

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Q1.

$A$ radioactive sample has a half-life of $5 \text{ years}$. The percentage of the fraction decayed in $10 \text{ years}$ will be: (in $\%$)

(A)

$25$

(B)

$50$

(C)

$75$

(D)

$90$

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Q2.

Two different radioactive elements with half-lives $T_1$ and $T_2$ have undecayed atoms $N_1$ and $N_2$ respectively, present at a given instant. The ratio of their activities at this instant is

(A)

$N_1T_1/N_2T_2$

(B)

$N_1T_2/N_2T_1$

(C)

$N_1T_2/T_1T_2$

(D)

$T_1T_2/N_1N_2$

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