List of top Physics Questions on Nuclei

પરમાણુ પ્રતિક્રિયા \( ^{238}\text{U} \to ^{234}\text{Th} + ^4\text{He} \) ને ધ્યાનમાં લો. દ્રવ્યમાન: 238.050 u, 234.043 u, 4.003 u. પ્રતિક્રિયાનું Q-મૂલ્ય (keVમાં) છે:

If the masses of proton and neutron are \(m_{p}\) and \(m_{n}\) respectively, the experimental masses of \({}_{2}He^{4}\) and \({}_{8}O^{16}\) nuclei are \(M_{1}\) and \(M_{2}\) respectively, then

The number of alpha and beta decays occurred when \(_{92}^{238}U\) changes to \(_{82}^{206}Pb\) are respectively:

If a radioactive substance decays by 40% and 70% in 10 and 30 minutes respectively, then the time taken for the substance to decay by 50% (in minutes) is:

Electron-positron annihilation produces photons. Momentum of each photon is: (m = $9\times10^{-31}$ kg)

If a thorium nucleus of mass number 232 and atomic number 90 emits six $\alpha$-particles and four $\beta$-particles, then the ratio of number of protons to neutrons in the final nucleus is:

The ratio of the rate of disintegration and the initial number of nuclei of a radioactive substance is $0.25~hour^{-1}$. The time taken (in hours) for the number of nuclei of this substance to become $\frac{1}{\sqrt{e}}$ times the initial number of nuclei is}

The reason for the constancy of binding energy per nucleon of nuclei whose mass number lies between 30 and 170 is

Find the energy released, if \(5\) g of \(^{235}\mathrm{U}\) is completely consumed in a chain reaction.

If the nuclear force between a proton and a neutron is attractive, then the distance between them can be:

In a nuclear reactor, heavy water (D_2O) is used as a moderator. Its main function is to:

Energy released in the fission of a single \( {}_{92}\text{U}^{235} \) nucleus is 200 MeV. The fission rate of a \( {}_{92}\text{U}^{235} \) fueled reactor operating at a power level of 5W is:

Binding energy per nucleon of deuteron and Helium nuclei are 1.1 MeV and 7 MeV respectively. If a single Helium nucleus was formed by adding two Deuterons, the energy released is

The atomic mass of an element $_{10}\text{X}^{20}$ is $198170\text{ amu}$. The binding energy per nucleon of that element is: (Given mass of neutron $= 00867\text{ amu}$, mass of proton $= 00783\text{ amu}$, and $1\text{ amu} = 931\text{ MeV}$)}

The main function of cadmium rods used in a nuclear reactor is to:

If the ratio of the nuclear radii of two atoms is $2:3$, then the ratio of their mass numbers is:

The INCORRECT statement is

Nucleons in nucleus are bound by

The expected mass of \({}^{12}_{6}C\) nucleus is (Mass of neutron is 1.00866 u; Mass of proton is 1.00727 u).

The energy released by $2.35\,g$ of $^{235}U$ by fission in a nuclear reactor (in $MeV$) is (Average energy released per fission is $200\,MeV$):

On an average, the number of neutrons and the energy of a neutron released per fission of a uranium atom are respectively

Two lighter nuclei combine to form a comparatively heavier nucleus by the relation \[ \frac{2}{1}\text{X} + \frac{2}{1}\text{X} = \frac{4}{2}\text{Y} \] The binding energies per nucleon of \( \frac{2}{1}\text{X} \) and \( \frac{4}{2}\text{Y} \) are 1.1 MeV and 7.6 MeV respectively. The energy released in this process is

The average energy released per fission for the nucleus of $^{235_{92}U$ is 190 MeV. When all the atoms of 47 g pure $^{235}_{92}U$ undergo fission process, the energy released is $\alpha \times 10^{23}$ MeV. The value of $\alpha$ is ___. (Avogadro Number $= 6 \times 10^{23}$ per mole)}

Which of the following pair of nuclei are isobars of the element?