Choose the correct options for the following questions.
The mass of aplha particle is equal to:
Difficulty: Easy
A:
That of one electron.
B:
That of one proton.
C:
That of one hydrogen.
D:
Four times the mass of one proton.
Rutherford's model of atoms failed because:
Difficulty: Easy
A:
It did not account for stability of the atom.
B:
The atom did not have a nucleus and electrons.
C:
It did not account for attraction between protons and neutrons.
D:
There is actually no space between nucleus and the electrons.
Max Plank proposed quantum theory in:
Difficulty: Easy
A:
1800
B:
1900
C:
2000
D:
1860
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