The electrons in a cathode-ray tube are produced by?
...The electrons in a cathode-ray tube are produced by?
heating a metal filament.
ionization of the air
applying a magnetic field to the y-plates.
applying an electric field to the x-plates
Correct answer is A
No explanation has been provided for this answer.
A body is launched from the earth’s surface, of radius R, so that it just escapes from the gra...
Which of the following particles are termed nucleons in a neutral atom? ...
The spectrum of white light consists of coloured lights arranged in the following order ...