α-Particles can be detected using
thin aluminium sheet
barium sulphate
zinc sulphide screen
gold foil
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
B.
- particle
- particle can be used to convert 13Al27 into 15P30 .
13Al27 + 2He4 15P30 + 0n1
According to Bohr, the angular momentum of an electron, in any orbit, should be :
h/2
nh/2
h/mv
2/nh
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