When an electron of charge e and mass m moves with a velocity v about the nuclear charge Ze in circular orbit of radius r, the potential energy of the electrons is given by
The energy of second Bohr orbit of the hydrogen atom is -328 kJ mol-1, hence the energy of fourth Bohr orbit would be
-41 kJ mol-1
-1312 kJ mol-1
-164 kJ mol-1
-82 kJ mol-1
If r is the radius of the first orbit, the radius of nth orbit of H-atom is given by
rn2
rn
r2 n2
For which one of the following sets of four quantum numbers, an electron will have the highest energy ?
n l m s
3 2 1
4 2 -1
4 1 0 -
5 0 0 -
The de-Broglie wavelength of a particle with mass 1g and velocity 100 m/s is
6.63×10-33 m
6.63×10-34 m
6.63×10-35 m
6.63×10-36 m
Electronic configuration of calcium atom can be written as
[Ne] 4p2
[Ar] 4s2
[Ne] 4s2
[Kr] 4p2
The value of Planck's constant is 6.63×10-34 Js. The velocity of light is 3.0×108 ms-1 . Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8×1015 s-1 ?
4×101
3×107
2×10-25
5×10-18
The orientation of an atomic orbital is governed by
azimuthal quantum number
spin quantum number
magnetic quantum number
principal quantum number
The spectrum of He is expected to be similar to that of
H
Na
Li+
He+
In the photo electron emission, the energy of the emitted electron is
greater than the incident photon
same as that of the incident photon
smaller than the incident photon
proportional to the intensity of incident photon
