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

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...

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...

SETS, RELATIONS & FUNCTIONS

SETS, RELATIONS & FUNCTIONS Sets 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. SETS Sets 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 ROSTER In 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} SE...

Sleep 360 Smart Bed

Hi, people ! What are you guys doing on this Sunday? Planning on sleeping all day? But sleeping would be useful only if your bed is comfortable enough! A smart bed would be perfect. Yes, a smart bed! The company Sleep Number brings you the Sleep number 360, the first smart bed ever!

Finding Square Roots Easily (Vedic Math)

Finding Square Roots Easily (Vedic Math) Hello, Guys!!! I’m back with another post on Vedic Math that is going to keep you glued rooted to your spot 😆. This time I’m going to teach you how to calculate the square roots of perfect squares faster… With a little practice, this method can let you calculate the roots in a matter of 5 seconds, whereas if you had used the traditional method, you would still be stuck with your question 😏 Things you need to know:- Perfect square which has unit digit 1 will have square root with the last digit as 1 or 9 Perfect square which has unit digit 4 will have square root with the last digit as 2 or 8 Perfect square which has unit digit 5 will have square root with the last digit as 5 Perfect square which has unit digit 6 will have square root with the last digit as 4 or 6 Perfect square which has unit digit 9 will have square root with the last digit as 3 or 7 Perfect square which has unit digit 0 will have square r...

Summer Transfer Window

SUMMER TRANSFER WINDOW Ah! It's finally summer and it is the time when football is at its peak. Transfer rumours, gossips, potential, possible lineups for the next season are what we see in news as well as on what is trending. English clubs are the biggest spenders in transfer market with net spendings being well over than 1 Billion euros in the latest season. Spain and Germany are followed next with newcomers China also being a prominent source of spending money and being. The transfer window is one of the busiest times for football clubs, even though no play is involved. Players may or may not be listed for transfers, loans and new contact signings, but the rumours are on top. Interests in a player by a club leads to gossips and predictions. But signing a player is not a very simple task. It is in fact very complicated. To simplify things: First, the club contacts the player and his agent and ask whether they are interested in a new club. If...

High School Pedia

Search This Blog