Publish On: 2019-05-20

Steeb more

Total Post: 416

Question: State the properties of cathode rays

Reply On: 2014-01-07

lala singh

Total Post: 22

ANS: State the properties of cathode rays

Some of the properties of cathode rays can be demonstrated rather easily. A few of these properties are listed below.

1. Cathode rays travel in straight lines perpendicular to the surface of the cathode. If a discharged tube contains a metal obstruction in the path of the cathode rays, the shadow cast by the obstruction is sharp, insulating that the rays travel in straight lines. If the surface of the cathode is made concave, the rays are focused at the center of curvature of the cathode which shows that the travel at right angles to the surface.

2. Cathode rays have kinetic energy. When an intense beam of cathode rays is allowed to fall on a target, the target is heated by the impact of the rays. Also if the target is movable, it can be set into motion by the impact of the particles.

3. Cathode rays can produce fluorescence. If a beam of cathode rays is allowed to fall on a suitable material, light is emitted. The color is characteristic of the fluorescing material. if the walls of the  tube are ordinary soft glass, they will fluoresce with an apple-green color. Some materials will continue to emit light for a short time after the beam has been discontinued.

4. Cathode rays can be defined by a magnetic field. If cathode rays are confined in small beam and a magnet is brought near, the pencil of rays is deflected in the direction in which moving negative charges would be deflected.

5. Cathode rays are deflected by an electrostatic field. If the narrow pencil of rays is passed between two plates, one of which is positive and the other negative, the electrons will be deflected towards the positive plate.

6. Cathode rays can produce x-rays. If the energy of the cathode rays is sufficiently high, very penetrating radiation is emitted when they strike a target. These penetrating rays are called x-rays. Their properties will be discussed in a later chapter.


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