Essay about P2 Table 5 History

Submitted By MrAwsumness78-MrAwsu
Words: 1479
Pages: 6
Open Document
Gurkirat Kamboj ( James Chadwick )
Andrew Calonge ( William Crookes )
Kevin Montenegro ( J.J. Thomson and Ernest Rutherford )
Ethan Kawough ( Robert Millikan )
William Mendez ( Niels Bohr ) The History of Atomic Structure
William Crookes
William Crookes was a British scientist most famously known for his experiment involving “Crookes’ Tubes”. Born in London, England, Crookes attended the Royal
College of Chemistry, becoming a chemist and physicist. After discovering the excess element Thallium from sulfuric acid production, Crookes set out to weigh this new element in a vacuum environment as to ensure accuracy in measurement. Observation of the element’s erratic reactions to a hot or cold state of being would be described by
Crookes as “repulsion from radiation”. William was then inspired by this information to construct a radiometer which spun in correlation to reactions between negatively charged objects and the contents of the vacuum tubes he created. This helped to determine the presence of mass for the contents of the tubes. Crookes’ later experiments with cathode/anode tubes containing low pressure gasses would be the most important. After observing a flash from the tubes’ reflective inner coatings in low light conditions, the discovery of a cathode ray was made. Radiation from the cathode of the tube formed a straight beam and had reflected off of the opposing end’s reflective coating, producing heat and phosphorescence. This tube experiment later became

known as “Crookes’ Tubes” and the cathode ray experiment would help to define an even smaller set of negatively charged particles known today as electrons.
­The diagram below depicts a model similar to that of Crookes’ in which phosphorescence created by the cathode ray(s) are visible on the anode or opposite end. J.J. Thomson
Thomson is an English physicist who ultimately disproved the idea of an indivisible atom. In his experiments, Thomson placed cathode rays into a vacuum tube making a cathode ray tube, which shoots a beam of electrons through the tube. Regardless of the
Gases within the vacuum tube or the material used for the cathode, the ray is unaffected so the particles must be part of all matter. However, when a magnet is placed on the vacuum tube, the ray is deflected, suggesting the particles must be charged. When using a magnet with known polarities on each end, the bean was attracted to the positive polarity, revealing that the particles are negatively charged. when he measured the charge­to­mass ratio of the particles, it was much less than that of a hydrogen atom, the smallest known atom. (Dingrando) This discovery proved that atoms could be divided further, debunking the indivisible belief from the 1700s. When

trying to explain why if atoms are made up of electrons, why is matter neutral, and what accounts for the rest of the mass of an atom, Thomson proposed a new model: the
Plum­pudding model. In this model, he proposed that in an atom, there a spherically shaped atom with a uniformly distributed positive charge, and the electrons are spread out equally throughout atom. Though inaccurate, Thomson’s model was the first to show an atom as divisible into smaller parts. (Joseph) This graph shows Thomson’s
Cathode Ray Tube, and how he deduced the existence of Elections.

Robert Millikan
Robert Millikan was an American physicist is best known for measuring a charge of an electron, this is which he won the Nobel Prize in Physics in 1923. One of Robert
Millikan’s most famous experiments, oil drop experiment, Robert used an atomizer to spray fine mist of oil droplets in an chamber to suspend the oil droplets in mid­air. In the chamber there was two electric charged plates, first plate was postively charged with a pinhole for the oil droplets to fall through once the droplets go through the pinhole an x­ray source was used ionize the gas molecules to make the oil droplets
Show More

Related Documents: Essay about P2 Table 5 History

Essay on Markov Chain and Probability

P1: FXS/ABE P2: FXS 9780521740524c14.xml CUAU021-EVANS July 17, 2008 8:40 C H A P T E R 14 Revision Revision of Chapters 10–13 14.1 Multiple-choice questions Questions marked with a † are based on Chapter 13. 1 Mary and Ann try to guess the month in which the other was born. The probability that both guess correctly is A 1 2 B 1 6 1 4 C D 1 24 E 1 144 2 Bag A contains 2 white and 3 black balls. Bag B contains 3 white and 2 black balls. If one ball is drawn from each bag the probability…

Words 3728 - Pages 15

A Method For Assessing Bond Performance Of Construction And Building Materials

with different shrinkage were compared.  Appearance, permeability and bond strength were tested on the same specimen.  This method can reflect the effect of repair material shrinkage on bond performance. a r t i c l e i n f o Article history: Received 12 January 2014 Received in revised form 4 May 2014 Accepted 29 June 2014 Available online 19 July 2014 Keywords: Repair materials Cement-based Shrinkage Assessment Bond performance a b s t r a c t A test method is proposed…

Words 5177 - Pages 21

Essay about Economic Fundamentals

Assessment 1 Product Possibility Frontier Table Of Contents Abstract – A two-product Market 2 Introduction 2 Product 1 – Bottle of Wine Resources 2 Avalability and efficiency over 100years 4 & 5 Product 2 – A Tour of the wine Regions of France Resource 3 Avalability and efficiency over 100years 6 Explanation of Efficency 7 Conclusion and Findings 8 & 9 References 10 Abstract - A Two-Product Market…

Words 2203 - Pages 9

Essay about Ms6000 Midterm

View Attempt 1 of 1 Title: Started: Submitted: Time spent: Midterm Exam March 14, 2011 1:11 PM March 14, 2011 3:40 PM 02:28:35 Total score adjusted by 0.0 Maximum possible score: 100 Total score: 99/100 = 99% Done 1-5 True/False Questions 1. MT T/F Q1 The break-even point is the volume that equates total revenue with total cost and profit is zero. Student Response True Score: 2/2 Value 100% Correct Answer True 2. MT T/F Q2 Random variations component in a regression model are movements…

Words 895 - Pages 4

Development of Cryptology Essay

Modular Arithmetic Modular Arithmetic is a type of maths which falls under the number theory category, and gives us a whole new perspective when looking at numbers. The most common use of this idea is through clocks where after you get to 12 the clock resets back to 1. Which then leads to these strange equations such as: 7 + 9 = 4 Or 9 + 9 = 6 When looking at these equations one might see them as being incorrect, which they are for a normal mathematical equations…

Words 4511 - Pages 19

Review On Productivity

productivity at a given time (P2) to the same process’ productivity at an earlier time (P1) P2  P1 Growth Rate  P1 Example – Last week a company produced 150 units using 200 hours of labor, and found to have 10 defective units – This week, the same company produced 180 units with 3 defective units using 230 hours of labor What is the change in productivity? (150  10) units P1  0.70 units / hour 200 hours (180  3) units P2  0.77 units / hour 230 hours P2  P1 0.77  0.70 Growth Rate …

Words 3123 - Pages 13

Essay about Economic decision making

TASMANIAN FORESTRY INDUSTRY STATE ANALYSIS. EXECUTIVE SUMMARY Tasmania is Australia’s most forested state, where it has one of the highest forest proportions on Earth. The Forestry industry in Tasmania is one of the most important economic resources for the Australian state, this industry is facing market problems because of the invasion of the low price imported timber products. To support the timber industry, the government has to take corrective actions like imposing…

Words 4087 - Pages 17

Linear Programming Essays

Linear Programming (LP) Linear programming, simply put, is the most widely used mathematical programming technique. It has a long history dating back to the 1930s. The Russian mathematical economist Leonid Kantorovich published an important article about linear programming in 1939. George Stigler published his famous diet problem in 1945 (“The Cost of Subsistence”). Of course, no one could actually solve these problems until George Dantzig developed the simplex method, which was published in 1951…

Words 2817 - Pages 12

Analysis Of Background Check, Fingerprinting And Drug Screen

Table of Contents Overview of Nursing Program and Tracks ..................................................................................................... 1 Background Check, Fingerprinting, and Drug Screen ................................................................................... 1-2 Important Dates ................................................................................................................................................... 2 Minimum Admission Requirements…

Words 3233 - Pages 13

Hospitality Management Essays

The Emerald Research Register for this journal is available at http://www.emeraldinsight.com/researchregister The current issue and full text archive of this journal is available at http://www.emeraldinsight.com/0144-3577.htm Service process design flexibility and customer waiting time Chwen Sheu and Roger McHaney Department of Management, College of Business Administration, Kansas State University, Manhattan, Kansas, USA, and Process design flexibility 901 Sunil Babbar Department…

Words 6777 - Pages 28