An atom stays in an excited state for about:
1.10 micro seconds
2.10 milli seconds
3.10 nano seconds
4.10 seconds
Artificial radioactivity was discovered by:
1.Joliot
2.Becquerel
3.Pauli
4.None of the above
For ionization of excited Hydrogen atom, the, required energy is:
1.a little less than 13.6
2. equal to 13.6
3.more than 13.6
4.3.4 or less
Half-life of a substance depends on:
1.pressure
2.temperature
3.density
4.None of the these
Isobars have the same:
1.A
2.Z
3.N
4.All the above
Isotones have the same:
1.A
2.Z
3.Neutron
4.All the above
Natural radioactivity was discovered by:
1.Joliot
2.Becquerel
3.Pauli
4.None of the above
P-decay produces:
1.isobars
2.isotopes
3.isotones
4.All the above
The binding energy of 42He is about:
1.28.3 eV
2.28.3 MeV
3.28.3 J
4.2.83 MeV
The binding energy of a deuteron is about:
1.2.22 MeV
2. 2.22 J
3.2.22 eV
4.None of the these
The concept of electron spin was introduced by:
1.Becquerel
2.Goudsmit
3.Millikan
4.Uhlenbeek and Goudsmit
The energy equivalent to mass defect is called :
1.binding energy
2.internal energy
3.external energy
4.enthalpy
The energy equivalent to one atomic mass unit is :
1. 1.6 × 10-19 J
2.6.02 × 1023 J
3.9.31 MeV
4.931 MeV
The mass of a neutron is:
1.1.00866 u
2.1.0866 u
3.1.866 u
4.0.1866 u
The principle that a quantum orbital cannot be occupied by more than two electrons was given by:
1.Pauli
2.Millikan
3.Hund
4.None of the above
The total energy that will be released if a nucleus is built from its constituents is called the:
1.binding energy of the nucleus
2.binding energy of the solid
3.binding energy of the atom
4.None of the above
Transmutation of nuclei was discovered by:
1.Rutherford
2.Becquerel
3.Pauli
4.None of the above
Who explained the splitting of special lines in magnetic field?
1.Zeeman
2.Bohr
3.Summerfield
4.Einstein