In a hydrogen atom, the electron revolving in the fourth orbit, has angular momentum equal to _____.

The electric potential of an electron is given by \(V={ V }_{ 0 } \ In\left( \frac { r }{ { r }_{ 0 } } \right) \), where r₀ is a constant. If Bohr atom model is valid, then variation of radius of n^th orbit r_n with the principal quantum number n is _____.

The fig. represents the observed intensity of X-rays emitted by an X-ray tube as a function of wavelength. The sharp peaks A and B denote ____________.
 

A beam of electron posses undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off and the same magnetic field is maintained, the electrons move ______________.

The energy of a photon of characteristic X-ray from a Coolidge tubes comes from ___________.

In a discharge tube, the source of positive rays is ________________.

J.J. Thomson discovered ________

The charge of an alpha-particle is _______________

Curie is a unit of _________________.

In gamma ray emission from nucli _____________.

α - rays consist of α - particles which are ______ nuclei.

β - rays are nothing but _______

Pressurised heavy-water reactors in our country generally use _____ as fuel.

The moderator used in nuclear reactor is ________________.

The explosion of hydrogen bomb is based on the principle of _________________.

Give the results of Rutherford alpha scattering experiment.

What is meant by excitation energy?

What is isobar? Give an example.

What is meant by radioactivity?

What is nuclear chain reaction?

What is the reason for using lighter nuclei as moderators?

What causes the sun to expand?

The ground state energy of hydrogen atom is -13.6 eV. What are k.E & P.E of the electron in this state?

Comment on the statement - "A nucleus contains to electrons and can eject them"

What is a reactor core?

Explain the J.J. Thomson experiment to determine the specific charge of electron.

Discuss the spectral series of hydrogen atom.

Discuss the alpha decay process with example.

Explain the idea of carbon dating.

Explain in detail the four fundamental forces in nature.

(a) Show that the ratio of velocity of an electron in the first Bohr orbit to the speed of light c is a dimensionless number.
(b) Compute the velocity of electrons in ground state, first excited state and second excited state in Bohr atom model for hydrogen atom.

Suppose the energy of an electron in hydrogen–like atom is given as E_n = \(-\frac { 54.4 }{ { n }^{ 2 } } eV\) where \(n \in \mathbb{N}\) . Calculate the following:
(a) Sketch the energy levels for this atom and compute its atomic number.
(b) If the atom is in ground state, compute its first excitation potential and also its ionization potential.
(c) When a photon with energy 42 eV and another photon with energy 51 eV are made to collide with this atom, does this atom absorb these photons?
(d) Determine the radius of its first Bohr orbit.
(e) Calculate the kinetic and potential energies of electron in the ground state.

Write the properties of neutrino?

Show that the decay rate 'R' of a sample of a radionuclide is related to the number of radioactive nuclei 'N' at the same instant by the expression R = λN.

With respect to power generation, what are the relative advantages and disadvantages of fusion type and Fission type reactors?

(a) A hydrogen atom is excited by radiation of wavelength 97.5 nm. Find the principal quantum number of the excited state
(b) Show that the total number of lines in emission spectrum is \(\frac { n(n-1) }{ 2 } \) Compute the total number of possible lines in emission spectrum as given in(a).

Explain the results of Rutherford α-particle scattering experiment.

Write the application of alpha decay in smoke detectors.

For a radioactive material, half-life period is 600s. If initially there are 600 number of molecules, find the time taken for disintegration of 450 molecules and the rate of disintegration.

The half-life of radium is 1600 years. After how many years will one gram of the pure radium be reduced to one centigram?

Two nuclei P, Q have equal number of atoms at t = 0. Their half-lives are 3 hours and 9 hours respectively. Compare their rates of disintegration, after 18 hours from the start.

In a fusion reactor, the reaction occurs in two stages.
(i) Two deuterium \((_{ 1 }^{ 2 }{ D) }\) nuclei fuse to form \((_{ 1 }^{ 3 }{ T) }\) a nucleus with a proton as a product.
(ii) A tritium nucleus fuses with another deuterium nucleus to form a  helium (\(_{ 2 }^{ 4 }{ He }\)) nucleus with a neutron as another product.
Find (a) the energy released in each stage.
(b) the energy released in the combined reaction per deuterium and
(c) what percentage of the mass-energy of the initial deuterium is released?
Given :
\(_1^{ 2 }{ D}\) = 2.014102 u, \(_{ 1 }^{ 3 }{ T }\) = 3.016049 u; \(_{ 2 }^{ 4 }{ He }\) = 4.002603 u, \(_{ 1 }^{ 1 }{ H }\) = 1.007825; \(_0^{ 1 }{ n }\) = 1.008665 u, Take 1u = 931 MeV

A power reactor develops energy at the rate of 30,000 kW. How many gram of ²³⁵U would be consumed daily? Assuming that on an average 200 MeV energy is released per fission.