Electric current in metal wires is due to the flow of
protons
neutrons
electrons
orbits
Which of the following waves ca be formed by rapidly changing electric and magnetic fields?
Oscillating waves
Sound waves
Electro magnetic waves
Short waves.
Who invented telephone?
J.J.Thomson
Robert Wolof
Graham Bell
Einstein
J.J. Thomson discovered electron in
1892
1893
1864
1895
The electro magnetic waves was invented by
Marconi
Marx Plank
Maxwell
Which among the following is used for recording in magnetic recording system?
Plastic tape
Disc
Diaphragm
Pencil
Cinematography works on the principle of
Electro magnetic indection
Persistence of vision
Chromatography
Photo electric effect
Radio works with the help of
electro magnetic waves
sound waves
light waves
magnetic waves
Matter has
mass
volume
both mass and volume
only mass but not volume
J.J. Thomson invented
molecule
atom
proton
electron
