The maximum kinetic energy of photo electrons ejected from a metal when it is irradiated with radiation of frequency 3.5 × 1014 s-1 is 6.626 × 10-20J.What is the threshold frequency of the metal ?
2.5 × 10-14 s-1
4.5 × 1014 s-1
2.5 × 1014s-1
2 × 10-14 s-1
The magnetic quantum number for the last electron in sodium atom is equal to
2
3
0
1
The total number of electrons present in all the s-orbitals, all the p-orbitals and all the d-orbitals of Rb+ ion are respectively
9, 18, 10
8, 10 18
8, 18, 10
8, 26, 10
What is the orbital angular momentum of an electron in 3s orbital ?
Zero
h/2π
√2 h/2π
None of these
The first energy shell that can have f - orbitals is
Second
First
Fourth
Third
What is the de Broglie wave length of a particle of mass 0.5g and velocity 50m/s ?
6.626 × 10-31m
2.65 × 10-32 m
2.65 × 10-31 m
none of these
Which one has the same unit that of Planck's constant ?
Energy
Work
Angular momentum
Linear momentum
In an atom with 2K, 8L and 13M electrons,what will be the total number of 'p' electrons ?
12
6
4
126 C and 146 C differ from each other in the number of
Nucleons
Mesons
Electrons
Protons
Electrons in various orbital are filled in the increasing order of
(n + s) value
(n + m) value
(n + l) value
(l + m) value
