(A) The initial amount of the sample is $12 \ g$. Since $6 \ g$ decays in $1 \ hr$,the half-life $(t_{1/2})$ of the substance is $1 \ hr$. After the f

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(A) The initial amount of the sample is $12 \ g$. Since $6 \ g$ decays in $1 \ hr$,the half-life $(t_{1/2})$ of the substance is $1 \ hr$. After the first hour,the remaining amount of the sample is $12 \ g - 6 \ g = 6 \ g$. In the next hour (the second half-life),half of the remaining $6 \ g$ will decay. Amount decayed in the next hour = $\frac{1}{2} \times 6 \ g = 3 \ g$.

Class 12 Chemistry Nuclear Chemistry Rate of decay and Half-life

Medium

If $12 \ g$ of a sample is taken,and $6 \ g$ of the sample decays in $1 \ hr$,the amount of the sample showing decay in the next hour is ........ $g$.

A
$3$
B
$1$
C
$2$
D
$6$

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Nuclear Chemistry

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Rate of decay and Half-life

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If $12 \ g$ of a sample is taken,and $6 \ g$ of the sample decays in $1 \ hr$,the amount of the sample showing decay in the next hour is ........ $g$.

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The half-life of a radioactive substance is $120$ days. After $480$ days,the amount of $4 \ g$ of the substance remaining will be: (in $g$)

The half-life of $C^{14}$ is $5760 \ years$. For a $200 \ mg$ sample of $C^{14}$, the time taken to change to $25 \ mg$ is (in $years$)

Radioactive lead $_{82}Pb^{201}$ has a half-life of $8 \ hours$. Starting from $1 \ mg$ of this isotope,how much will remain after $24 \ hours$?

$A$ sample of rock from the moon contains an equal number of atoms of uranium and lead ($t_{1/2}$ for $U = 4.5 \times 10^9$ years). The age of the rock would be:

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