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
Which one of the following does Bohr theory fails to explain ?
Stability of hydrogen
Line spectra of hydrogen atom
Line spectra of Lli2+
Splitting of spectral lines in the presence of magnetic field
The transition of electron from n = 3 to n = 1 will produce the shortest wave length in
Li2+
H
He+
H+
The ground state of an atom means that all the electrons are
Having the same energy
In the lowest possible energy state
In the first orbit
In the nucleus
How many number of spherical nodes will be in 4p orbitals ?
1
3
2
Zero
Which orbit of He+ ion has h/π as its angular momentum of the electron ?
First
Second
Third
Fourth
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
Isotones are nuclei having
Different atomic numbers
Same mass number
Same number of protons
Same number of neutrons
The energy difference between the electron in the ground state in hydrogen atom and Be3+ ion is
204 eV
109 eV
27 eV
12 eV
What is the time taken for an electron to complete an revolution in the Bohr orbit of hydrogen atom ?
4π2mr2/nh
h/2πmr
nh.4π2mr
2πmr/n2h2