Question

Cathode rays are:
A) Electromagnetic waves
B) Stream of particles
C) Stream of electrons
D) Radiations

Answer 1

Hint:To answer this question we need to know the origin of cathode rays. We will also discuss the characteristics of cathode rays. And also we should know all the sources from which cathode rays can be generated. In 1839, Michael Faraday discovered cathode rays. A detailed discussion is done below.


Complete answer:
Cathode rays are streams of electrons seen in vacuum tubes. If an emptied glass tube is furnished with two terminals and a voltage is applied, the glass inverse the negative anode is seen to sparkle from electrons produced from the cathode. Electrons were first found as the constituents of cathode beams. The picture in an exemplary TV is made by an engaged light emission diverted by electric or attractive fields in cathode beam tubes (CRTs).
Cathode beams are so named on the grounds that they are discharged by the negative anode, or cathode, in a vacuum tube. To deliver electrons into the cylinder, they should initially be confined from the atoms of the cathode. The early cool cathode vacuum tubes, called Crookes tubes, utilized a high electrical potential between the anode and the cathode to ionize the lingering gas in the cylinder. The electric field quickened the particles and the particles delivered electrons when they crashed into the cathode.
Cathode beams are imperceptible, yet their quality was first recognized in early vacuum tubes when they struck the glass mass of the cylinder, energizing the particles of the glass and making them discharge light—a sparkle called fluorescence. Scientists saw that items put in the cylinder before the cathode could project a shadow on the gleaming divider, and understood that something should go in straight lines from the cathode. After the electrons arrive at the anode, they travel through the anode wire to the force supply and back to the cathode, so cathode beams help electric flow through the cylinder.

So,the correct option is C.

Note:Michael Faraday passed a current through a rarefied air-filled glass tube and noticed a strange light arc with its beginning at the cathode (negative electrode) and its end almost at the anode (positive electrode). And that was the light which we can’t see through naked eyes is called cathode rays. It was one of the biggest discoveries of that time. And we can summarize it as a stream of electrons.