Atomic number of an element is equal to the number of :
protons
neutrons
electrons
protons + neutrons
The de Broglie wavelength associated with a ball of mass 1kg having kinetic energy 0.5 J is
6.626 10-34 m.
13.20 10-34 m.
10.38 10-21m.
6.626 10-34.
Wave nature of electrons was demonstrated by :
Schrodinger
De-Broglie
Davisson and Garmer
Heisenberg
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
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