If half life of a radioactive element is $3\, hours$, after $9\, hours$ its activity becomes
If half life of a radioactive element is $3\, hours$, after $9\, hours$ its activity becomes
- A
$1/9$
- B
$1/27$
- C
$1/6$
- D
$1/8$
Similar Questions
An archaeologist analyses the wood in a prehistoric structure and finds that $C^{14}$ (Half life $= 5700\, years$) to $C^{12}$ is only one-fourth of that found in the cells of buried plants. The age of the wood is about ..........$years$
An archaeologist analyses the wood in a prehistoric structure and finds that $C^{14}$ (Half life $= 5700\, years$) to $C^{12}$ is only one-fourth of that found in the cells of buried plants. The age of the wood is about ..........$years$
- [AIIMS 2013]
Half-lives of two radioactive elements $A$ and $B$ are $20$ minutes and $40$ minutes, respectively. Initially, the samples have equal number of nuclei. After $80$ minutes, the ratio of decayed number of $A$ and $B$ nuclei will be
Half-lives of two radioactive elements $A$ and $B$ are $20$ minutes and $40$ minutes, respectively. Initially, the samples have equal number of nuclei. After $80$ minutes, the ratio of decayed number of $A$ and $B$ nuclei will be
- [JEE MAIN 2016]
Half life of a radioactive element is $10\, days$. The time during which quantity remains $1/10$ of initial mass will be .........$days$
Half life of a radioactive element is $10\, days$. The time during which quantity remains $1/10$ of initial mass will be .........$days$
The half life period of radium is $1600$ years. The fraction of a sample of radium that would remain after $6400$ years is
The half life period of radium is $1600$ years. The fraction of a sample of radium that would remain after $6400$ years is
- [AIPMT 1991]
Out of the following, which one is not emitted by a natural radioactive substance?
Out of the following, which one is not emitted by a natural radioactive substance?