Atoms and Nuclei

In the reaction \({}_1^2\)H + \({}_1^3\)H \(\to\) \({}_2^4\)He + \({}_0^1\)n, if the binding energies of \({}_1^2\) H, \({}_1^3\)H and \({}_2^4\)He are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction i...

Which one of the following pairs of nuclei are isotones ?

In any fission process the ratio

mass of fission products
mass of parent nucleus
is

A nucleus represented by the symbol \({}_Z^AX\) has

If M(A; Z), Mp and Mn denote the masses of the nucleus \({}_Z^AX,\) proton and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its bonding energy in MeV, then

If in a nuclear fusion process the masses of the fusing nuclei be m1 and m2 and the mass of the resultant nucleus be m3, then

The half life of radian is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after

The Bohr model of atoms

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force \(\overrightarrow F\) between the two is

The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of \({}_2^4\) He is
(Given helium nucleus mass \(\approx\) 4.0015 u.)

A nuclear reaction given by
ZXA \(\to\) z+1YA + \(-\)1e0 + \(\overline v\) represents

In which of the following systems will the radius of the first orbit (n = 1) be minimum ?

Solar energy is mainly caused due to

A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element in the sample after two mean lives is

The mass number of a nucleus is

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

A deutron is bombarded on 8O16 nucleus then \(\alpha\)-particle is emitted. The product nucleus is

A sample of radioactive element containing 4 \(\times\) 1016 active nuclei. Half life of element is 10 days, then number of decayed nuclei after 30 days

Which of the following are suitable for the fusion process ?

Mn and Mp represent the mass of neutron and proton respectively. An element having mass M has N neutrons and Z protons, then the correct relation will be

The energy of hydrogen atom in nth orbit is En then the energy in nth orbit of singly ionised helium atom will be

X(n, \(\alpha\)) \({}_3^7\)Li, then X will be

Half life of a radioactive element is 12.5 hour and its quantity is 256 g. After how much time its quantity will remain 1 g?

The interplanar distance in a crystal is 2.8 \(\times\) 10\(-\)8 m. The value of maximum wavelength which can be diffracted

Energy released in nuclear fission is due to

Which rays contain (positive) charged particles ?

Nuclear fission is best explained by

The relation between \(\lambda\) and T1/2 as (T1/2 \(\to\) half life)

Maximum frequency of emission is obtained for the transition

For the given reaction, the particle X is
\(_6{C^{11}} \to {}_5{B^{11}} + {\beta ^ + } + X\)

The life span of atomic hydrogen is

When an electron does transition from n = 4 to n = 2, then emitted line spectrum will be