What is the ratio of the radii of the 2nd and 3rd Bohr orbits in hydrogen atom ?
3:8
3:4
9:16
4:9
How many electrons will be present in the highest principal energy level of cobalt (z = 27) ?
2
7
9
1
Which is the spectral line obtained when an electron jumps from n = 6 to n = 4 energy level ?
Paschen series
Brackett series
Lyman series
Pfund series
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 maximum number of electrons in an atom that can have the quantum numbers n = 3, ml = +1 ?
8
4
16
6
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
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
What is the number of electrons in K19 which have n = 3 and l = 1 ?
The wave length of the first line of Balmer series of hydrogen atom is 6561Ao. The wave length of the third line of the series is
2180 Ao
4339 Ao
13122 Ao
5865 Ao
How many number of spherical nodes will be in 4p orbitals ?
3
Zero
