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

In a nuclear reactor, cadmium rods are used to _____________

Graphite is used as a __________ in nuclear reactors.

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

Minimum size of a system in which at least 1 neutron is available for further fission is called __________

Irene Curie and F. Joliot discovered ______ in the year 1934.

Gamma rays are extensively used to destroy __________ affected cells

Elements having atomic number greater than ______ are radioactive.

In the given nuclear fission reaction, 'X' denotes which particle?
₉₂U₂₃₅ + ₀n₁ ➝ ₅₆Ba¹⁴¹ + ₃₆Kr⁹² + 3X + Q

For first-order X-ray diffraction, the wavelength in of the X-ray is equal to the lattice spacing at a glancing angle is _____________.

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 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 ____________.
 

An alpha nucleus of energy 1/2 mv² bombards a heavy nuclear target of charge Ze. Then the distance of the closest approach for the alpha nucleus will be proportional to ____________.

The ground state energy of a hydrogen atom is 13.6 eV. The energy needed to ionize H₂ atom from its second excited state ______________.

Bohr's postulate is based on _______________.

A radiative element has N₀ number of nuclei at t = 0. The number of nuclei remaining after half of a half-life _____.(that is, at time t = \(\frac{1}{2}T_\frac{1}{2}\))

A radioactive nucleus (initial mass number A and atomic number Z) emits two α-particles and 2 positons. The ratio of number of neutrons to that of proton in the final nucleus will be _____.

If the nuclear radius of ²⁷Al is 3.6 fermi, the approximate nuclear radius of ⁶⁴Cu, in femi is _____.

The ratio of the wavelengths radiation emitted for the transition from n = 2 to n = 1 in Li⁺⁺, He⁺ and H is _____.

Suppose an alpha particle accelerated by a potential of V volt is allowed to collide with a nucleus of atomic number Z, then the distance of closest approach of alpha particle to the nucleus is _____.