Which theory observed that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration ?
Heisenberg's uncertainty principle
Pauli's exclusion principle
Aufbau principle
Hund's rule of maximum multiplicity
Where does the cathode rays get deflected?
A magnetic field only
An electric field only
Both electric and magnetic field
None of these
What is the ratio between the energy of a photon of 1500 Ao wave length radiation to that of 3000 Ao wave length radiation ?
1/4
1/2
4
2
How many number of spherical nodes will be in 4p orbitals ?
1
3
Zero
What is the maximum number of electrons in an atom that can have the quantum numbers n = 3, ml = +1 ?
8
16
6
Isotones are nuclei having
Same atomic numbers
Same mass number
Same number of protons
Same number of neutrons
Which one of the following does Bohr theory fails to explain ?
Stability of hydrogen
Line spectra of hydrogen atom
Line spectra of Li2+
Splitting of spectral lines in the presence of magnetic field
If λ1 and λ2 are the wave lengths of characteristic X - ray and gamma rays respectively then what is the relation between them ?
λ1 = λ2
λ1 > λ2
λ1 = 1/λ2
λ1 < λ2
The fundamental particle which is responsible for keeping the nucleons together is
Electron
Proton
Positron
Meson
What is the frequency ratio between two radiations of wave length 400nm and 700nm in the visible spectrum ?
14/8
4/7
8/14
15/8