Properties of cathode rays

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Presentation transcript:

Properties of cathode rays www.lankanstudent.weebly.com

Travel in straight lines or travel linearly

MALTESE CROSS TUBE Plucker made an anode into a Maltese cross, and this produced a shadow in the glow at the end of the tube. This showed that the cathode rays traveled in straight lines.

The emission of cathode rays is perpendicular to the cathode

Cathode rays can create momentum

Crookes reported that a paddle wheel placed in the path of the cathode rays turned. This proved that the cathode rays carried energy, and that they might be made of particles. This also indicates that the rays (particles) moved from the cathode to the anode.

Cathode rays are negatively charged.

Crookes showed that the rays were deflected by a magnetic field. Crookes noted that charged particles in a magnetic field experience a force. Cathode rays behaved as if they were negatively charged particles.

Cathode rays in an electric field

Those experiments were conducted to identify properties of cathode rays

More properties of cathode rays

Properties of cathode rays Move along straight lines The emission of cathode rays is perpendicular to the cathode Cathode rays can create momentum(mv) which is the ability to create the mechanical force. (cathode rays have particle properties) Cathode rays are negatively charged. The properties of cathode rays are independent from the cathode material and the gas inside the cathode ray tube. Cathode rays originate at the cathode and move towards the anode Cathode rays can penetrate through thin Al foils. Cathode rays can create light green glowings on scintillating material Cathode rays can increase the temperature of an object during a collision. Cathode rays can create images on photographic plates Cathode rays can ionize gases Velocity of cathode rays is less than that of light (1/10C=3x107ms-1) X rays can be generated after the collision of cathode rays with a metal target e/m ratio of cathode rays is a constant. This was illustrated by J.J.Thompson.

Some extra knowledge

The deflecting plates deflected the particles in one direction. Magnetic coils deflected the particles in the other direction. BY adjusting the relative strength of the electric and magnetic fields, the particles went straight. From measurements and equations for deflecting particles by magnetic and electric fields, the charge to mass ratio was determined (1.76 X 1011 C/kg). The charge to mass ratio (Q/M) was the same regardless of the potential difference used to accelerate particles. Q/M was the same for different cathode materials. This indicates that there must be a similarity between particles making up different cathode materials. Similar experiments with hydrogen ions, showed that the hydrogen lon's charge to mass ratio was 1836 times smaller than for cathode rays. If we assumed that equal charges were present on the hydrogen ions and cathode ray particles, then the mass of the cathode ray particles was 1/1836 of the mass for the hydrogen ion. The hydrogen atom is the smallest atom, yet these particles were smaller. This meant that the atom was not the smallest particle. Thomson concluded that cathode rays were light, fast moving, negative particles, that were a part of an atom. Thomson called the cathode ray particle, the ELECTRON.

PROPERTIES OF CATHODE RAYS They are produced by the negative electrode, or cathode, in an evacuated tube, and travel towards the anode. They travel in straight lines and cast sharp shadows. They have energy and can do work. They are deflected by electric and magnetic fields and have a negative charge. They are beams of tiny, negatively charged particles called electrons.

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