Question

cathode ray is positively charged or negativley

Answer 1

cathode ray is negetively charged
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Answer 2

Hey friend here is your answer.....

Answer :

Cathode rays are negatively charged particles.

Cathode Rays :

A discharge tube is a long glass tube at the two ends of which are sealed two metal plates . These ways can be connected to a high voltage source and are called electrodes . The electrode connected to the negative terminal of the source is called the cathode , and the one connected to the positive terminal is called the anode . There is also a side tube which can be connected to one exhaust pump, used for lowering the pressure of the gas inside the discharge tube.

When I voltage is applied across the terminals, and the pressure inside the tube is 0.01-0.001mm of mercury, the end of the tube opposite the cathode starts glowing . This phenomenon is called fluorescence . Investigations have shown that sum in visible rays, starting from the cathode , fall on the opposite word of the tube, causing fluorescence . These rays were named cathode rays .

The characteristics of cathode rays :

Sir J J Thomson and others found that cathode rays have the following characteristics.

1. They originate at the cathode and travel in straight lines.

" When an object is placed in the path of cathode rays, a shadow of the object falls on the wall opposite of the cathode . A Shadow can be formed only when the rays travel in straight lines ".

2. Cathode rays are a stream of particles.

" A light paddle wheel, placed in the path of the cathode rays, rotates . This shows that some particles strike the plates of the wheel ".

3. The particles constituting cathode rays are negatively charged.

" This is provided by the fact that the cathode rays bend towards the positive plate in an electric field ".


4. The particles constituting cathode rays are all alike . They do not change with the gas, the electrodes and the kind of glass used for making the tube .

" Thus , Sir J J Thomson concluded that the particles constituting cathode rays for a Universal constituent of all atoms . These particles where named electrons in 1897 .



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