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 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
For azimuthal quantum number l = 3, the maximum number of electrons will be
2
6
0
14
If r is the radius of the first orbit, the radius of nth orbit of H-atom is given by
rn2
rn
r2 n2
The uncertainty in momentum of an electron is 1×10-5 kg-m/s. The minimum uncertainty in the measurement of the momentum of the helium atom is
1.05×10-28 m
1.05×10-26 m
5.27×10-30 m
5.25×10-28 m
Electronic configuration of calcium atom can be written as
[Ne] 4p2
[Ar] 4s2
[Ne] 4s2
[Kr] 4p2
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
Who modified Bohr's theory by introducing elliptical orbits for electron path ?
Hund
Thomson
Rutherford
Sommerfeld
The spectrum of He is expected to be similar to that of
H
Na
Li+
He+
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
