In hydrogen atom, energy of first excited state is -3.4 eV. Then, KE of same orbit of hydrogen atom is
+ 3.4 eV
+ 6.8 eV
- 13.6 eV
+ 13.6 eV
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
The electron was shown experimentally to have wave properties by
de-Broglie
N Bohr
Davisson and Germer
Schrodinger
An ion has 18 electrons in the outermost shell, it is
Cu+
Th4+
Cs+
K+
For azimuthal quantum number l = 3, the maximum number of electrons will be
2
6
0
14
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
If ionisation potential for hydrogen atom is 13.6eV, then ionisation potential for He+ will be
54.4 eV
6.8 eV
13.6 eV
24.5 eV
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 position of both, an electron and a helium atom is known within 1.0 mm. Further the momentum of the electron is known within 5.0×10-26 kg ms-1 .The minimum uncertainty in the measurement of the momentum of the helium atom is
50 kg ms-1
80 kg ms-1
80×10-26 kg ms-1
5.0×10-26 kg 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
