The phenomenon of radioactivity is
The phenomenon of radioactivity is
- A
Exothermic change which increases or decreases with temperature
- B
Increases on applied pressure
- C
Nuclear process does not depend on external factors
- D
None of the above
Similar Questions
$99 \%$ of a radioactive element will decay between
$99 \%$ of a radioactive element will decay between
- [AIIMS 2019]
The radioactive sources $A$ and $B$ have half lives of $2\ hr$ and $4\ hr$ espectively, initially contain the same number of radioactive atoms. At the end of $2\ hours$, their rates of distintegration are in the ratio
The radioactive sources $A$ and $B$ have half lives of $2\ hr$ and $4\ hr$ espectively, initially contain the same number of radioactive atoms. At the end of $2\ hours$, their rates of distintegration are in the ratio
Following statements related to radioactivity are given below
$(A)$ Radioactivity is a random and spontaneous process and is dependent on physical and chemical conditions.
$(B)$ The number of un-decayed nuclei in the radioactive sample decays exponentially with time.
$(C)$ Slope of the graph of $\log _{e}$ (no. of undecayed nuclei) $Vs$. time represents the reciprocal of mean life time $(\tau)$.
$(D)$ Product of decay constant ( $\lambda$ ) and half-life time $\left(T_{1 / 2}\right)$ is not constant.
Choose the most appropriate answer from the options given below
Following statements related to radioactivity are given below
$(A)$ Radioactivity is a random and spontaneous process and is dependent on physical and chemical conditions.
$(B)$ The number of un-decayed nuclei in the radioactive sample decays exponentially with time.
$(C)$ Slope of the graph of $\log _{e}$ (no. of undecayed nuclei) $Vs$. time represents the reciprocal of mean life time $(\tau)$.
$(D)$ Product of decay constant ( $\lambda$ ) and half-life time $\left(T_{1 / 2}\right)$ is not constant.
Choose the most appropriate answer from the options given below
- [JEE MAIN 2022]
A radioactive substance emits
A radioactive substance emits
A sample originally contaived $10^{20}$ radioactive atoms, which emit $\alpha -$ particles. The ratio of $\alpha -$ particles emitted in the third year to that emitted during the second year is $0.3.$ How many $\alpha -$ particles were emitted in the first year?
A sample originally contaived $10^{20}$ radioactive atoms, which emit $\alpha -$ particles. The ratio of $\alpha -$ particles emitted in the third year to that emitted during the second year is $0.3.$ How many $\alpha -$ particles were emitted in the first year?
- [AIEEE 2012]