This website uses cookies to ensure you have the best experience. Learn more

Measuring Electron Movement, Trajectory, And Charge To Mass Ratio

2188 words - 9 pages

The e/m (electron charge: mass) of electrons

The aim of this experiment was to study the movement and trajectory of an electron that moves perpendicular to a magnetic field and measure the charge-to-mass ratio of an electron.
An electron beam was fired through a magnetic and electric field. These two fields are connected to two power supplies and these power supplies are altered. The alteration of these voltages will change the strength of the electric and magnetic fields. Varying the magnetic and electric fields will change the trajectory of the electron. From this it can be shown that the path of an electron is circular in a uniform magnetic field and parabolic in electric fields. With a known anode voltage from the electron gun and by varying the strengths of the electric and magnetic fields the charge-to-mass ratio of an electron can be calculated.
This experiment was first done by J.J Thomson in 1897. The result from this was that he discovered that the atom was not a fundamental unit of matter and that it had charged constituents that could not be separated. Thomson investigated the nature of the cathode rays which then resulted in the conclusion that the cathode rays were negatively charged constituents of the atom; hence the discovery of the electron.
In this experiment a Thomson tube can be used to measure the deflection of electrons in magnetic and electric fields. A Thomson tube is a cathode ray tube which contains an electron gun and a florescent screen. The florescent screen illuminated when the electron gun was turned on and from this the trajectory of the electrons can be measured. By applying a known voltage for both the electric and magnetic fields the charge of the electron can be deduced.
In this experiment the charge-to-mass ratio was calculated to be 2.24 × 〖10〗^5 C〖Kg〗^(-1).

The power supply to the capacitor plate will set up an electric field, the power supply to the Helmholtz coils will set up a magnetic field and the anode voltage was the accelerating voltage across the electron gun.
Experimental Method
The procedure of the experiment is as follows:
The anode voltage was set to 4kV and the voltage across the capacitor plate was set to zero, hence the electric field was zero in magnitude.
The current through the Helmholtz coils was set to 0.1, 0.2 and 0.3 Amps. At each current value the path of the electrons were measured in (x,y) co-ordinates. These co-ordinates were then plotted.
The anode voltage was kept at 4kV and the current through the Helmholtz coils was set to zero.
The voltage across the capacitor plates was set to three different voltages (2 kV, 4kV and 6kV) and the path of the electrons was recorded on a set of (x,y) co-ordinates for each voltage. These co-ordinates were then plotted.
The anode voltage was again set to 4kV. By altering the voltage across the capacitor plates and the current through the Helmholtz coils you...

Find Another Essay On Measuring Electron Movement, Trajectory, and Charge-To-Mass Ratio

A Response to “Mass Media and its influence on society.”

986 words - 4 pages According to Raja Mujtaba, the author of “Mass media and its influence on society” (2011), nowadays, in this information age, the media truly affects our lives in both good and bad ways depended on the motive and types of media. Each of the types contains difference effects to people in all ages. However, all the impacts have raised awareness and need to know the current information in order to make decisions for their lives. People

Investigate and find the relationship between heat loss (of water) and surface area to volume ratio of animals

1083 words - 4 pages To investigate the relationship between surface area : volume ratio and heat loss.INTRODUCTION:The aim of this experiment is to investigate and find the relationship between heat loss (of water) and surface area to volume ratio of animals. To investigate this, we are going to use three flasks of different volume (as the equivalent the animals) and thus different surface areas filled with water.BACKGROUND:Surface Area : Volume RatiosWe will be

The Civil Rights Movement and To Kill a Mockingbird

1348 words - 5 pages The beginning of the Civil Rights Movement era corresponds with the time that Harper Lee was writing about Scout Finch and her brother Jem. They live in the very state that events like the Montgomery Bus boycott would take place. The fictional town of Maycomb is in Alabama, the same state where Martin Luther King Jr. would rise to be the voice of African Americans aching for equality. The actual movement may have started in 1960 but that is the

The movement of professional jobs to India and China

1989 words - 8 pages The movement of professional jobs to India and ChinaSince many years ago, highly labor-intensive jobs, such as manufacturing, have started moving to developing countries, like India and China, from developed countries, such as U.S. UK, and Japan. This did cause some problems but not strike at the heart of the United States, since they believed that white-collar jobs would take blue-collar jobs. However, the recent movement of professional jobs


2427 words - 10 pages thorough diagnosis of tooth width-to-length ratio in each patient. The aims of this study were to compare width-to-length ratio of maxillary anterior teeth and evaluate the existence of Recurring Esthetic Dental (RED) Proportion in subjects (both males and females) with smiles considered attractive by the public. MATERIALS AND METHODS Fifty male subjects and fifty female subjects in the age group of 21-30 years were selected for this study. For

The Attitude to War in The Charge of the Light Brigade By Alfred Lord Tennyson and Dulce et Decorum Est by Wilfred Owen

2295 words - 9 pages The Attitude to War in The Charge of the Light Brigade By Alfred Lord Tennyson and Dulce et Decorum Est by Wilfred Owen 'Dulce et Decorum Est' and 'The Charge of the Light Brigade' are about battle and soldiers; they portray the experience of war in different ways. Both poems employ visual imagery of battle and the effects on the people. 'The Charge of the Light Brigade' is more about the actions of the whole brigade

How Should the Teacher Be in Terms of Preparation, Academic Background and Personality in Order to Be in Charge of an English Course?

2539 words - 10 pages Preparation matters ¿How should the teacher be in terms of preparation, academic background and personality to be in charge of an English course? The ideal class is the dream of any teacher. It is as if we wanted to know the magic secret to make the class everybody would like to attend. There are requirements, techniques, ways, and exercises to take into account in order to make a class that everybody would say: this is the class I will never

Experiment to Calculate Acceleration of Mass and Velocity of Free-Falling Object

1384 words - 6 pages LAB 1 REPORT Experiment 4: Free Fall Lab Performed: February 18, 2014 Shelanita R. Stokes Llopis PHYSICS LAB 107-101 Professor Stephen Baker Tuesday, 9:30-12:30 Tuesday, March 25, 2014 Experiment 4: Free Fall Objective: To calculate the acceleration of a mass as it falls toward earth’s surface and calculate the average velocity when measuring the total distance that the mass moved during some period of time. We had to determine the

Newton's Second Law - Practical Report: To determine the relationship between force, mass and acceleration

842 words - 3 pages Aim:a:, To observe changes in motion due to changes in force and measure force, mass and acceleration, and examine their influence on motion.b: To investigate the relationship between the variables; mass, force and acceleration and determine an inertial mass through the use of a trolley, ticker-timer and set of slotted masses.Introduction:Newton's second law states "The acceleration of an object as produced by a net force is directly

The Influence of Mass Media in Relation to Adolescent Smoking and Drinking Behaviours

632 words - 3 pages influence of peers and mass media. The influence exerted by mass media is of great concern to psychologists, as the last century has seen mass media (i.e. those widely-available channels of communication that reach a large audience – the print, magazines, TV, film, and increasingly, the internet) develop exponentially according to advances in technology, to become a central part of everyday life. Today, mass media it is ubiquitous, omnipresent and

What causes contributed to the Rwandan genocide? - Society and mass violence - Essay

1554 words - 7 pages The Rwandan genocide was the largest mass murder to occur in modern African history, between April and June 1994, an estimated 800,000 Rwandans were killed in the space of 100 days (Prunier, 1999). This atrocity is largely credited as the result of both over- and underlying tensions between the two ethnic groups; Hutus, and Tutsis. The sheer speed of the massacre and how the international community failed to intervene left people disconcerted

Similar Essays

The Mass Observation Movement And Its Contribution To The British National Heritage

2870 words - 11 pages Marta Kazimierek DSM 1THE MASS OBSERVATION MOVEMENT AND ITS CONTRIBUTION TO THE BRITISH NATIONAL HERITAGEOn Saturday, 14 August 1937, Evening Telegraph published an article announcing "About 1300 people will be observing themselves and their neighbours and writing a report of their observation" (Evening Telegraph 8). They were to write about their ordinary lives, report on their attitudes on questions of general interest, record their holidays

Surface Area To Volume Ratio And The Relation To The Rate Of Diffusion

1330 words - 5 pages Surface Area to Volume Ratio and the Relation to the Rate of DiffusionAim and BackgroundThis is an experiment to examine how the Surface Area / Volume Ratio affects the rate of diffusion and how this relates to the size and shape of living organisms.The surface area to volume ratio in living organisms is very important. Nutrients and oxygen need to diffuse through the cell membrane and into the cells. Most cells are no longer than 1mm in

Sports And Movement: Improvements To Muscular Power

941 words - 4 pages energy source from the ATP-PC system. Every one of us has different ratios of Type II fast twitch fibres to Type I slow twitch fibres (Holloszy, & Coyle 1984). Elite sprinters would certainly have a greater amount of fast twitch fibres than slow twitch fibres and going by research by Baughman, Takaha, & Tellez (1984) backs this claim by suggesting the higher the ratio of Type II fibres to Type I fibres means the better the ability to move faster

Financial Statement And Ratio Analysis: Key Tools To Successful Financial Management

2633 words - 11 pages degree of operating leverage, the financial manager must carefully consider the types of operating and financial costs the firm should incur. Additionally, management should recognize that with greater fixed costs comes higher risk. Lastly, a firm's capital structure can be assessed by using debt management ratios such as the debt ratio, times interest earned (TIE), and fixed charge coverage ratio (Ross, 2005).Because it is crucial for a company to