List of top Physics Questions on Nuclei

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)}

Let the binding energy per nucleon of nucleus be denoted by $ E_{bn} $ and radius of the nucleus by $ r $. If mass numbers of nuclei A and B are 64 and 125 respectively, then

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

If the half life of an element is 10 minutes, then the time taken (in minutes) for the element to decay from 20% to 80% is

If mass of 5 neutrons is x, mass of 2 protons is y and the mass of the nucleus $_{10}X^{20}$ is z, then the binding energy of the nucleus X is (Speed of light in vacuum is c)

During the disintegration of a radioactive nucleus of mass number 208 at rest, two alpha particles each with kinetic energy E are emitted. The total kinetic energy of the emitted alpha particles and the daughter nucleus after the disintegration is

When an element $_{90}^{232}\text{Th}$ decays into $_{82}^{208}\text{Pb}$, the number of $\alpha$ and $\beta^{-}$ particles emitted respectively are

If a nucleus P converts into a nucleus Q by the decay of one alpha particle and two $\beta^-$ particles, then the nuclei P and Q are

If a radioactive substance decays 10% in every 16 hours, then the percentage of the radioactive substance that remains after 2 days is

If the number of uranium nuclei required per hour to produce a power of 64 kW is $7.2 \times 10^{18}$, then the energy released per fission is

A radioactive material of half-life 2.5 hours emits radiation that is 32 times the safe maximum level. The time (in hours) after which the material can be handled safely is

In a nuclear fission reaction of an isotope of mass $ M $, three similar daughter nuclei of the same mass are formed. The speed of a daughter nuclei in terms of mass defect $ \Delta M $ will be:

The mass number of nucleus having radius equal to half of the radius of nucleus with mass number 192 is:

A nucleus has mass number $A_1$ and volume $V_1$. Another nucleus has mass number $A_2$ and volume $V_2$. If the relation between mass numbers is $A_2 = 4A_1$, then $\frac{V_2}{V_1} =$ _______.

The mass defect in a particular reaction is $ 0.4 \, \text{g} $. The amount of energy liberated is $ n \times 10^7 \, \text{kWh} $, where $ n = $ _____. (speed of light $ = 3 \times 10^8 \, \text{m/s} $)

The disintegration energy Q for the nuclear fission of ²³⁵U → ¹⁴⁰Ce + ⁹⁴Zr + n is _____ MeV.

Given atomic masses:
²³⁵U = 235.0439 u
¹⁴⁰Ce = 139.9054 u
⁹⁴Zr = 93.9063 u
n = 1.0086 u

Value of c² = 931 MeV/u.

A nucleus at rest disintegrates into two smaller nuclei with their masses in the ratio of 2:1. After disintegration they will move

The electric potential at the surface of an atomic nucleus $ (z = 50) $ of radius $ 9 \times 10^{-13} $ cm is $\_\_\_\_\_\_\_ $$\times 10^{6} V$.

Draw the graph showing the variation of scattered particles detected ($ N $) with the scattering angle ($ \theta $) in the Geiger-Marsden experiment. Write two conclusions that you can draw from this graph. Obtain the expression for the distance of closest approach in this experiment.

Differentiate between nuclear fission and fusion.

The mass of proton, neutron and helium nucleus are respectively $10073\, u$, $10087\, u$ and $40015\, u$ The binding energy of helium nucleus is:

The ratio of the density of oxygen nucleus $\left({ }_8^{16} O \right)$ and helium nucleus $\left({ }_2^4 He \right)$ is

Consider the following radioactive decay process ${ }_{84}^{218} A \xrightarrow{\alpha} A_1 \xrightarrow{\beta^{-}}A_2 \xrightarrow{\gamma} A_3 \xrightarrow{\alpha} A_4 \xrightarrow{\beta^{+}} A_5 \xrightarrow{\gamma}A_6$ The mass number and the atomic number of $A_6$ are given by:

Nucleus $A$ having $Z=17$ and equal number of protons and neutrons has $12 MeV$ binding energy per nucleonAnother nucleus $B$ of $Z=12$ has total 26 nucleons and $18 MeV$ binding energy per nucleons The difference of binding energy of $B$ and $A$ will be ___$MeV$

Assume that protons and neutrons have equal masses Mass of a mucleon is $16 \times 10^{-27} kg$ and radius of nucleus is $15 \times 10^{-15} A ^{1 / 3} m$ The approximate ratio of the nuclear density and water density is $n \times 10^{13}$ The value of $n$ is ___