List of top Physics Questions on Nuclei

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

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

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:

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

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}

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:

If the mean life of a radioactive substance is \[ \frac{20}{\ln4} \] minutes, then the ratio of the number of atoms remaining undecayed and the number of atoms decayed of the substance at a time of \(30\) minutes is

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

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:

If a graph is drawn between the binding energy per nucleon and the mass number of nucleus, then the mass number of the nucleus for which the binding energy per nucleon has a maximum value is

What are isotone nuclei? In a nucleus average mass of nucleons is \(1.67\times10^{-27}\) Kg. Find the density of nucleus. [Given \(R_0 = 1.2\times10^{-15}\) m.]

In a nuclear fusion reaction mass defect is 0.2%. What will be amount of energy released in the fusion of 1 kg mass?

What is the phenomenon of radioactivity? How many types are there of radioactive decay?

In the given nuclear reaction, particle W is: \[ {}_{2}^{4}\text{He} + {}_{Z}^{A}X \ \rightarrow\ {}_{Z+2}^{A+3}Y + W \]

Write the characteristics of nuclear force. How is it different from gravitational and electric (electrostatic) forces?

Find out equivalent energy of 1·0 gm of a substance.

Write the difference between isotopic, isobaric and isotonic nuclei. Give an example of each.

Explain the proton-neutron hypothesis in the structure of nucleus.

What is the phenomenon of radioactivity?

Explain nuclear fission and nuclear fusion with examples.

Define mass defect and binding energy.

Write the formula relating the radius and mass number of a nucleus and show that nuclear density does not depend on the mass number.

From which part of the atom are radioactive radiation emitted?