The maximum number of electrons in a subshell having the same value of spin quantum number is given by
l (l + 1)
√l(l + 1)
l + 2
2l + 1
The ratio of the time periods of revolutions of the electron in the third orbit of hydrogen and second orbit of He+ is
32:1
2:27
16:1
27:2
What is the uncertainty in the position of a particle when the uncertainty in momentum is zero ?
6.626 × 10-34
4.14 × 10-35
Zero
Infinity
Heisenberg's uncertainly principle is applicable to
Atoms only
Electrons only
Nucleus only
Any moving particle
The wave number of the first line of Balmer series of hydrogen is 15200cm-1. The wave number of the first line of He+ is
30400cm-1
60800cm-1
76000cm-1
45600cm-1
126 C and 146 C differ from each other in the number of
Nucleons
Mesons
Electrons
Protons
What is the Bohr radius associated with hydrogen atom ?
0.529 × 10-10 cm
5.29 × 10-10m
0.529 ×10-10m
None of these
The quantum number +1/2 and -1/2 for the electron spin represent
Rotation of the electron in clockwise and anticlockwise direction respectively
Rotation of the electron in anticlockwise and clockwise direction respectively
Magnetic moment of the electron pointing up and down respectively.
Two quantum number mechanical spin states which have no classical analogue.
Name the atom which does not contain neutron ?
Carbon
Hydrogen
Neon
Helium
The electrons of potassium were not ejected when red light fall on a piece of potassium metal. The electrons will be ejected when
Intensity of light is increased
Wave length of light is increased
Wave number of light is increased
Amplitude of light is increased
