CBSE
Multiple Choice Questionsα-Particles can be detected using
thin aluminium sheet
barium sulphate
zinc sulphide screen
gold foil
The most probable radius (in pm) for finding the electron in He+ is
0.0
52.9
26.5
105.8
emits 8 α-particles and 6 β-particles. The neutron/proton ratio in the product nucleus is
60/41
61/40
62/41
61/42
How many neutrons are there in nucleus 'X', if it gives 7N14 after two successive - particle emissions ?
7
10
14
09
Which particle can be used to change 13Al27 into 15P30 ?
Neutron
- particle
Proton
Deuteron
Wave nature of electrons was demonstrated by :
Schrodinger
De-Broglie
Davisson and Garmer
Heisenberg
The isoelectronic pair is
Cl2O, ICl2-
ICl2-, ClO2
IF2+, I3-
ClO2-, ClF2+
Quantum numbers of an atom can be defined on the basis of :
Hund's rule
Pauli's exclusion principle
Aufbau's principle
Heisenberg's uncertainty principle
According to Bohr, the angular momentum of an electron, in any orbit, should be :
h/2
nh/2
h/mv
2/nh
The energy equivalent to 1 amu., is :
931.1 MeV
1.492 x 1013 erg
1000 J
107 erg
