Skip to main content

Cathode Ray Experiment


  • This experiment was conducted by J.J. Thomson (Sir Joseph John Thomson) in the year 1897.
  • This experiment proved that atom is made up of fundamental particles which are much smaller than the smallest atom 'hydrogen'
  • This experiment helped to discover electron.
  • According to J.J. Thomson, the cathode rays consisted of very light, small and negatively charged particles.
  • He named the particles "corpuscles" which were later known as electrons



Apparatus Used

  • A cathode tube ray was taken in which there were 2 electrodes i.e. Anode(+ve) and the cathode (-ve).

  • The tube was filled with an inert gas.
  • There was a vacuum pump in the tube.
  • High voltage (5000v-10000v) was allowed to flow through the system.
  • It was observed that when the gas was at 1atm(atmospheric pressure) no change was seen in the tube. When the pressure was decreased inside the tube, the tube started glowing.


Experiments Conducted


1) A thin metal foil was placed between the 2 electrodes.

    Observation:  The metal foil started to glow due to heat.
    
    Conclusion: This beam of ray was made up of high energy particles.


2) An object was placed between the 2 electrodes.

    Observation: A sharp shadow was formed on the anode.

    Conclusion: The beam of rays were travelling from cathode to anode.



3) A light weight paddle wheel was placed between the 2 electrodes.

    Observation: The paddle started rotating.

    Conclusion: The beam contains high energy particles, which on striking the paddle wheel rotates it.


4) An external electric field was placed.

    Observation: The beam of light deflected towards the positive plate.

    Conclusion: Particles of the beam are negatively charged.




You Might Also Like


Comments

Post a comment

Popular Posts

Anode Ray Experiment

→Anode ray experiment was conducted by E Goldstein.

→These rays are also known as canal rays.

→This experiment helped in the discovery of the proton.


Apparatus Used A discharge tube was taken in which there were 2 electrodes i.e. Anode(+ve) and the cathode (-ve).The tube was filled with an inert gas.A perforated or porous cathode was used.
A layer of zinc sulphide was placed at the back of the cathode.There was a vacuum pump in the tube.High voltage (5000v-10000v) was allowed to flow through the system.It was observed that when the gas was at 1atm(atmospheric pressure) no change was seen in the tube. When thepressurewas decreased inside the tube, a glow could be seen at the back side of the cathode.

SETS, RELATIONS & FUNCTIONS

SETS, RELATIONS & FUNCTIONSSets are a fundamental part of mathematics and it’s knowledge is very important in present. It defines the concepts of relation and functions. These functions are also very essential for present day maths. SETSSets are denoted by capital letters. They are similar to matrices whose elements are denoted by small letters. But in sets an element comes only at once. Sets are matrices which give a sense of belonging. This sense of belongingness is represented by ∈ .We can write anything in a set like rivers of India, Wonders of the World .etc.  For an example let there be a set of positive single digit. Let the set be denoted as A Therefore, 8 ∈ A  Also we can write, 17 ∈ A Set can be represented by two types  ROSTERIn roster form we write elements in curly brackets and separate them with comma.  If there be set of positive integers less than 10. Therefore the set will be {1,2,3,4,5,6,7,8,9}  SET- BUILDER FORMIn set-builder form we take a variable x and then gives its…

Isotopes, Isobars and Isotones

Isotopes

These are elements which have the same atomic number but different atomic mass.They have the same atomic number because the number of protons that are inside their nuclei remains the same.But, they have different atomic mass because the number of neutrons that are also inside their nuclei is different.As the number of protons inside nuclei remains same, therefore the overall charge of the elements also remains same as in isotopes: no of protons = no of electrons.Hence, as isotopes overall charge remains neutral, therefore their chemical properties will also remain identical.Therefore, Isotopes are chemically same but physically different.

Top 5 Best PC Games

Hi, this is highschoolpedia, and today we are going to show you our list of top 5 PC games that you must play. So let's get started...

1) FIFA 17
FIFA 17 is the latest football video game in the FIFA series. It released on 27 September 2016 in North America and globally. FIFA 17 will be the first FIFA game in the series to use the Frostbite game engine. It is the first FIFA game to have a story mode. It is available in 2 versions.

Android Versions Named After Sweet

Have you ever thought why are Android versions always named after sweet names ??

Everytime a new Android version is launched its name is kept after a sweet name. Many people have researched about this topic and many have asked Google also. Have you ever tried to find out the core reason behind this? If not then you would find the answer here .

First of all let us first see what Google says about this :

In 2008 i.e. the year when Android was launched a reporter asked the reason for the same. At that time Google said

“It’s kind of like an internal team thing, and we prefer to be a little bit — how should I say — a bit inscrutable in the matter, I’ll say,” said Randall Sarafa, a Google spokesman. “The obvious thing is that, yeah, the Android platform releases, they go by dessert names and by alphabetical order for the most part."



Sectors of Indian Economy

Hey there all the tenthees.
You guys must be facing a lot of pressure as it is a board class as quoted by many teachers. You need to take care of each and every stuff including the small stats too.

But unfortunately most of the Economics books we got do not have the graph 3 for the chapter Sectors of Indian Economy.

No worries guys you came to the right place. We are providing you with the graph of December 2015 edition which is the latest graph which we need.
All the best for your board exams and here you go






Once again All the very best guys !!!

Lets talk STARS

Hey guys, have you ever spent any of your nights at the uncovered top floor or backyard of your house. If you have then this article will help know about all the things, you just observed out there in the space or even if you did not have this article will help you observe and understand all the miracles that happen in that huge space above us.

In this one, we will talk about STARS-

STARS
There are about 6k-10k stars that a person with a normal eyesight can observe in that huge space.(well that number varies according to your eyesight)You might have observed or will observe that the stars in the space are not all the same in brightness and color.Well, the brightness of a star depends on the combination of 2 reasons.The ACTUAL BRIGHTNESS -   Actual brightness of a star refers to the magnitude of real brightness that, that particular star have.You can think of that as energy.Different stars have different levels of energy(brightness).The star with more energy will be the brightest while th…