α-Particles can be detected using
thin aluminium sheet
barium sulphate
zinc sulphide screen
gold foil
C.
zinc sulphide screen
α-particles can be detected by using zinc sulphide screen. It is used as phosphor in detection.
How many neutrons are there in nucleus 'X', if it gives 7N14 after two successive - particle emissions ?
7
10
14
09
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