What is radioactivity?
(N/A) Radioactivity is the phenomenon of spontaneous emission of active radiations (such as $\alpha, \beta$,or $\gamma$ rays) from the nuclei of unstable atoms.
It is a nuclear process that occurs regardless of the physical or chemical state of the substance.
The rate of decay is governed by the law of radioactive decay,which states that the number of nuclei decaying per unit time is proportional to the total number of radioactive nuclei present at that instant,expressed as $dN/dt = -\lambda N$,where $\lambda$ is the decay constant.
It is a nuclear process that occurs regardless of the physical or chemical state of the substance.
The rate of decay is governed by the law of radioactive decay,which states that the number of nuclei decaying per unit time is proportional to the total number of radioactive nuclei present at that instant,expressed as $dN/dt = -\lambda N$,where $\lambda$ is the decay constant.
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Similar Questions
$A$ radioactive nucleus decays as follows. If the atomic number of $X$ is $72$ and the mass number is $180$,what are the mass number and atomic number of $X_4$?
$X \xrightarrow{\alpha} X_1 \xrightarrow{\beta} X_2 \xrightarrow{\alpha} X_3 \xrightarrow{\gamma} X_4$
$X \xrightarrow{\alpha} X_1 \xrightarrow{\beta} X_2 \xrightarrow{\alpha} X_3 \xrightarrow{\gamma} X_4$
Difficult
View SolutionObtain the maximum kinetic energy of $\beta$-particles and the radiation frequencies of $\gamma$-decays in the decay scheme shown in the figure. You are given that:
$m(^{198}Au) = 197.968233 \; u$
$m(^{198}Hg) = 197.966760 \; u$
$m(^{198}Au) = 197.968233 \; u$
$m(^{198}Hg) = 197.966760 \; u$
Difficult
View Solution$A$ nucleus $_Z{X^A}$ emits $9 \alpha$-particles and $5 \beta$-particles. The ratio of total protons to neutrons in the final nucleus is:
Medium
View Solution$A$ nucleus of mass $218\, amu$ in a free state decays to emit an $\alpha$-particle. The kinetic energy of the emitted $\alpha$-particle is $6.7\, MeV$. The recoil energy (in $MeV$) of the daughter nucleus is:
Medium
View SolutionAssertion: ${}^{90}Sr$ from the radioactive fallout of a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.
Reason: The energetic $\beta$-particles emitted in the decay of ${}^{90}Sr$ damage the bone marrow.
Reason: The energetic $\beta$-particles emitted in the decay of ${}^{90}Sr$ damage the bone marrow.
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