Question

cathode rays contains electrons right, but it also firms shadow, light also forms shadow but it doesn't contains particles then why cathode rays being rays contain electrons? ​

Answer 1

How are cathode rays termed as electrons?

J.J. Thomson experimented with cathode ray tubes. He showed that cathode rays consisted of particles with a negative charge. He called these particles electrons.

These experiments marked the first discovery of a subatomic particle.

What did the cathode ray tube experiment discover?

Electrons were discovered as the constituents of cathode rays in 1897 by British physicist J. J. Thomson. He showed the rays were composed of a previously unknown negatively charged particle, which was later called the electron. Cathode ray tubes (CRTs) use a focused beam of electrons deflected by electric or magnetic fields to create the image in a classic television set.

Some properties of cathode rays:

They travel linearly

They have a negative electric charge

They have particle property

Magnets can deflect them

Charge/mass ratio of the rays is constant

They travel from the cathode to the anode

Their properties are independent from the electrodes and gas present in the cathode ray tube.

Cathode rays can ionize gas

The travel more slowly than light

They can heat objects that they hit

They can penetrate through thin Aluminium plates

They can make phosphors glow.

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