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.

Enjoy your high school with - High School Pedia : www.highschoolpedia.com

Comments

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."

Rutherford Alpha Ray Scattering Experiment

Rutherford Alpha Ray Scattering Experiment Hey, Guys, most of you might have heard about the alpha ray scattering experiment and if you want to know in detail about Rutherford's model and the experiment he conducted, this is the right place for you... But first: Things You Must Know Some basic information that will help you understand rutherford experiment properly: Proton is a sub-atomic particle which is positively charged and has a mass of 1u. Alpha particles are helium atom with a charge of +2 as they have lost 2 electrons. Alpha particles have an atomic mass of 4u. Gold is highly malleable and can be beaten into very thin sheets. Experiment Rutherford conducted his experiment in the following way: Rutherford took a very thin gold foil and bombarded it with high energy alpha particles. He placed a layer of zinc sulphide on the walls where the experiment was taking place because when alpha particles ...

High School Pedia

It is an initiative by some students to spread the light of knowledge to everyone and everywhere. It was started in the year 2015 and has grown rapidly in the past few months. By the means of this website, we try to provide information on every topic that we can reach up to. You can find different articles on this website. All these articles are written in simple language so that everyone can understand it and learn from it. We at High School Pedia believe in creative learning and this is the reason why we add our own edited graphical representations in every article. Once a very learned man said, “Knowledge increases by not keeping it to yourself but by sharing it with others”. And we follow the same motto “Share to Learn”. The team of High School Pedia tries its best to provide you with the best and original content. Unlike many other websites, High School Pedia is famous for its original and inspiring content.

Important Mathematical Constants!

Important Mathematical Constants Mathematical constants are those numbers that are special and interesting because they come up in the various fields of mathematics like geometry, calculus etc. These mathematical constants are usually named after the person who discovered it and they are represented by a symbol that is usually picked up from the Greek alphabet. Mathematical constants are by definition very important. In this article we will take a look at certain mathematical constants that are more commonplace than others. 1. π (pi) or Archimedes constant (~3.14159): π is defined as the ratio of the circumference of a circle to its diameter. This is probably the most popular mathematical constant. So π is the circumference of the circle whose diameter is 1 unit. You might have seen it popping up when calculating the area of a circle (πr 2 ) or the circumference of a circle (2πr). It has many uses throughout mathematics from calcula...

Animal and Plant Cells

Cells Cells are the basic functional, biological and structural unit of life. The word cell is a Latin word meaning ‘small room’. Cells are also known as building blocks of life. The branch of science that deals with the form, structure, and composition of a cell is known as Cytology. All organisms around us are made up of cells. Bacteria, ameba, paramecium, algae, fungi, plants and animals are made up of cells. Cells together form tissues. And tissue together makes an organ. History Of Cell The cell was discovered by Robert Hooke in 1665. He assembled a simple microscope and observed a very thin slice of cork under his primitive microscope. The cork was obtained from the outer covering of a tree called bark. Robert Hooke observed many little-partitioned boxes or compartments in the cork slice. These boxes appeared like a honey-comb. He termed these boxes as the cell. He also noticed that one box was separated from another by a wa...

Pokemon Go 0.33.0

All Pokemon go fans get ready because again the latest version of Pokemon go is out. The Niantic has released a new version of Pokemon go i.e. 0.33.0.The size of the new version is 61.48MB.

Leviation

LEVITATION You know the classic magician’s trick in which he makes something or somebody levitate? Yeah well, it isn’t magic (obviously!). In fact, there are over 8 different ways in which he can make something levitate. As a side note though, all of the following methods are fairly complicated. In all honesty what he actually probably does is hang the “thing” by a string. You got conned… What is Levitation? Levitation is flying’s younger brother who was ignored when his elder brother became possible. It’s a sad story… Though in all seriousness levitation and flying are different. So please don’t be a jerk and post a comment saying, “Hey you relic! Levitation is already happening. Have you never sat in a plane before?!” Levitation is (according to Google) and I quote “the action of rising or causing something to rise and hover in the air, typically by means of supposed magical powers.” Way to go Google! I thought we already cleared up that fact that magic isn’t rea...

High School Pedia

Search This Blog