Question

Is cathode ray move with velocity as speed of light ?

Answer 1

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NO, Cathode is negatively charged electron ray, so offcourse they are not even able totravel at speed of light.
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Answer 2

Cathode rays are streams of fast moving electrons.

Properties : (i) Cathode rays are emitted normally from the cathode surface. Their direction is independent of the position of the anode.

(ii) Cathode rays travel in straight lines. (Cast shadows of objects placed in their path).

(iii) Cathode rays exert mechanical force on the objects they strike.

(iv) Cathode rays produce heat when they strike a material surface.

(v) Cathode rays produce fluorescence when they strike a number of crystals, minerals and slats.

(vi) When cathode ray strike a solid object, specially a metal, X-rays are emitted from the object. (It is not safe to use Geissler tube at potential differences above about 5–6 kV because of this X-ray emission, generated by striking of cathode rays of metal anode).

(vii) Cathode rays are deflected by an electric field and also by a magnetic field. The direction of deflection is the same as that of a stream of negatively charged particles.

(viii) Cathode rays ionize the gas through which they are passed.

(ix) Cathode rays can penetrate thin foils of metal.

(x) Cathode rays affect photographic plates.

(xi) Cathode rays are found to have velocity upto one tenth of the velocity of light. The e/m of electrons was measured by J.J. Thomson (so credit of discovering electron is given to Thomson).

The e of electron was measured by R.A./Millikan e/m = 1.759 x 1011 c/kg e = 1.602 x 10–19 C m = 9.09 x 10–31 kg

The e/m of an electron is called the specific charge of an electron.

If one includes the relativistic variation of mass with speed then specific charge of an electron decreases with the increase in the velocity of the electron.