J.J. Thomson discovered electron in
1892
1893
1864
1895
The discovery of electrons lead to a new branch of physics called
Optics
thermal physics
nuclear physics
electronics
Radio works with the help of
electro magnetic waves
sound waves
light waves
magnetic waves
Electric current in metal wires is due to the flow of
protons
neutrons
electrons
orbits
TV was invented by
James Watt
Edison
J.L.Biard
Graham Bell
Matter has
mass
volume
both mass and volume
only mass but not volume
The atomic number of an atom is equal to its
number of nucleus
number of neutrons
number of electrons
atomic mass
J.J. Thomson invented
molecule
atom
proton
electron
The electro magnetic waves was invented by
Marconi
Marx Plank
Maxwell
The velocity of electro magnetic waves.
3 lakh kilometers per second
5 lakh kilometers per second
4 lakh kilometers per second
1 lakh kilometers per second
