Theory of Radioactive Disintegration

The half life of a radioactive isotope is three hours. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 hours would be

If $M$ is atomic mass, $A$ is a mass number, What is meaning of  $\frac{\left(M-A\right)}{A}$?

Define magic numbers of nucleus of an atom.

The half-life of ${}^{40}\mathrm{K}$ is $1.28\times {10}^9 \mathrm{years}.$ What mass of this nuclide (in mg) has an activity of $1.00 \mathrm{\mu Ci}?$

(Given ${\mathrm{N}}_{\mathrm{A}}=6.023\times {10}^{23}$)

Report your answer up to two places of decimal.

If $5 \mathrm{g}$ of a radioactive substance has ${\mathrm{t}}_{\frac{1}{2}}=14 \mathrm{h}, 20 \mathrm{g}$ of the same substance will have a ${\mathrm{t}}_{\frac{1}{2}}$ equal to

The rate of the process: $\mathrm{Cu}\to \mathrm{Ni}+{}_{+1}{}^0\mathrm{e}$

Radioactive disintegration rate is affected by

Half-life of a radioactive sample is $2\mathrm{x}$ years. What fraction of this sample will remain undecayed after $\mathrm{x}$ years?

Which of the following statements are correct?

Which of the following statements are correct?

The mass defect of the nuclear reaction ${}_5\mathrm{B}^8{\to }_4{\mathrm{Be}}^8{+}_1{\mathrm{e}}^0$ is $\mathrm{\Delta m}$. The wrong expression is/are

The mass defect of the nuclear reaction ${}_5\mathrm{B}^8{\to }_4{\mathrm{Be}}^8{+}_1{\mathrm{e}}^0$ is $\mathrm{\Delta m}$. The wrong expression is/are

Mass of $1 \mathrm{amu}$ gives energy equal to

For two different disintegration half-lives are equal at equilibrium. This is possible when

One becquerel of radioactivity is equal to

The nuclide lying below the stability belt in $\mathrm{n}-\mathrm{p}$ graph does not disintegrate by

A radioactive nuclide generally disintegrates by $\mathrm{\alpha }-$emission when its $\mathrm{N}/\mathrm{P}$ ratio is

The number of stable isotopes is the least when the number of neutrons and protons in the isotopes are, respectively,

The binding energy per nucleon of ${}^{16}\mathrm{O}$ is $7.97 \mathrm{MeV}$ and that of ${}^{17}\mathrm{O}$ is $7.75 \mathrm{MeV}$. The energy in $\mathrm{MeV}$ required to remove a neutron from ${}^{17}\mathrm{O}$ is

STATEMENT-1: Specific activity of the same radioactive substance is same for 10g radioactive substance as well as 50g radioactive substance.

STATEMENT-2: Specific activity of a radioactive substance is its activity per g.