The number of nodal planes in 2pz orbital is
Zero
One
Two
Infinity
The longest wavelength of light that can remove and electron from the third orbit of He+ ion is
2055 Ao
2000nm
2055 × 10-20m
2055m
The maximum number of electrons in an atom that can have the quantum numbers n = 3, ml = +1 is
8
4
16
6
Caesium metal emits electrons when exposed even to red light but zinc requires violet light. From this it can be concluded that
Electrons emitted from Caesium have more energy
Electrons emitted from zinc have more energy
Zinc has a lower work function
Caesium has a lower work function
The probability of finding the electron at a distance 'r' from the nucleus regardless of the direction is
3/4 πr3 R3
4/3 πr3 R2
4π r2 R2
4/3π r3 R
If the speed of electron in the Bohr's first orbit of hydrogen atom is 'V' then the speed of the electron in the fourth orbit is
4V
V/4
V/2
V/16
The product of Δx and Δv is highest for
Neutron
Electron
Proton
α - particle
Isotones are nuclei having
Different atomic numbers
Same mass number
Same number of protons
Same number of neutrons
The ratio of kinetic energy and potential energy of an electron in a Bohr orbit of a hydrogen-like species is
1
-1
1/2
-1/2
The frequency ratio between two radiations of wave length 400nm and 700nm in the visible spectrum is
14/8
4/7
8/14
15/8
