In the photoelectron 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
Which of the following statements do not form a part of Bohr's model of hydrogen atom ?
Energy of the electrons in the orbits are quantised
The electron in the orbit nearest the nucleus has the lowest energy
Electrons revolve in different orbits around the nucleus
The position and velocity of electrons in the orbit cannot be determined simultaneously
The electronic configuration of Cu (atomic number 29) is
1s2,2s2,2p6,3s2,3p6,4s2,3d9
1s2,2s2,2p6,3s2,3p6,3d10,4s1
1s2,2s2,2p6,3s2,3p6,4s2,4p6,5s2,5p1
1s2,2s2,2p6,3s2,3p6,4s2,4p6,3d3
The orbitals are called degenerate when
they have the same wave functions
they have the same wave functions but different energies
they have different wave functions but same energy
they have the same energy
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 -
Which of the following is not permissible arrangement of electrons in an atom ?
n = 4, l = 0, m = 0, s = -1/2
n = 5, l = 3, m = 0, s = + 1/2
n = 3, l = 2, m = -3, s = -1/2
n = 3, l = 2, m = -2, s = -1/2
The radius of hydrogen atom in the ground state is 0.53 Å. The radius of Li2+ ion (atomic number = 3) in a similar state is
0.17 Å
0.53 Å
0.265 Å
1.06 Å
Given, the mass of electron is 9.11×10-31 kg Planck's constant is 6.626×10-34 Js,
the uncertainty involved in the measurement of velocity within a distance of 0.1Å is
5.79×106 ms-1
5.79×107 ms-1
5.79×108 ms-1
5.79×105 ms-1
The energy absorbed by each molecule (A2 ) of a substance is 4.4× 10-19 J and bond energy per molecule is 4.0× 10-19 J. The kinetic energy of the molecule per atom will be
2.0× 10-20 J
2.2× 10-19 J
2.0× 10-19 J
4.0× 10-20 J
The electron was shown experimentally to have wave properties by
de-Broglie
N Bohr
Davisson and Germer
Schrodinger
