LEE DEFOREST AND THE EARLY AUDIONS In 1906 Lee DeForest announced the development of the first three-element vacuum-tube detector in The Audion: A New Receiver for Wireless Telegraphy‚ from the Scientific American Supplement. The original Audion was capable of slightly amplifying received signals‚ but at this stage could not be used for more advanced applications‚ such as radio transmitters. The inefficient design of the original Audion meant it was initially of little value to radio‚ and
Premium Radio Vacuum tube
conclusion is that the higher salt concentration in the solution the greater the decrease in mass of the potato will be‚ the graph I have drawn supports my conclusion. The 10% salt concentration shows that on average the potato loses 2.6% of its overall mass. 20% salt concentration shows a further decrease in mass this time it is an average of 13% overall mass decrease. 30% salt concentration shows an average decrease of 18.8% in overall mass. The 0% salt concentration actually shows a mass increase
Premium Cell wall Osmosis Cell
Purpose: To find the percent of sugar by mass in chewing gum Hypothesis: The percentage of chewing gum that is sugar for bubble gum is 30%‚ 20% for juicy fruit and 25% for stride gum. Mass Of Juicy Fruit Mass Of Bubble Gum Mass of Juicy Fruit unchewed | 7.12g- 1.72 = 5.4 g | 5.80g- 1.72g = 4.08 | 4.52g- 1.72g = 2.80g | chewed | 3.00g- 1.72g= 1.28g | 2.24g-1.72g =0.52g | 2.86g-1.72g= 1.14g | Percent of Sugar | 3.00g x 100/ 5.4 = 55.5%
Premium Water Sugar Chewing gum
The Gettysburg Address: Why‚ how and what happened? On November 19‚ 1863‚ during the Civil War of the United States‚ a speech was held in Gettysburg‚ Pennsylvania‚ that would later go down as one of the greatest in American history. The speech was held during the dedication of the Gettysburg Cemetery‚ a cemetery founded to honour the deceased soldiers of the battle of Gettysburg. The 272 word long address which the then current president Lincoln held at this event have been remembered ever since
Premium Abraham Lincoln Abraham Lincoln American Civil War
solution is common in an average household for it is used for cooking and cleaning. By definition‚ a titration is a technique where a solution of known concentration is used to determine the concentration of an unknown solution. Titrations are performed in chemistry‚ along with different manufacturing companies‚ to help determine the concentrations of acids and bases when they are unknown‚ when a neutralization reaction occurs. There are a couple important parts of a Titration that are imperative
Premium Titration PH indicator Base
Sarah Helms Thursday/ 11:15am #1 Escherichia coli There are many types of microorganisms and ways to treat each one. Knowing the differences of each is vital to treat a patient correctly. The purpose of this report is to explain the process and steps used to identify a certain microorganism referred to as the unknown. Materials and Methods A test tube with an unknown microorganism will be retrieved. Once the test tube is retrieved‚ a steak for isolation will be completed in order to produce isolated
Premium Bacteria Microbiology Gram staining
Diffusion: the movement of fluids from an area of high concentration to a lower concentration Cell theory: -All living things are made up of one or more cells and their product -Cells is the simplest unit that can carry out all processes -All cells come from preexisting cells Prokaryote: no nucleus or other membrane: bound organelles (E-Coli) Eukaryote: has a nucleus and other organelles‚ each surrounded by a thin membrane (Animals/human if multicell‚ amoeba if single cell) Organelles
Premium Cell
“What Happened” is a memoir written by former First Lady of the United States‚ Senator‚ Secretary of State and Democratic nominee for president Hillary Clinton. In the book‚ she explains to the best of her ability what she thinks happened in the 2016 presidential election that cost her the election to Donald Trump. The book is divided into 6 chapters which all have a certain number of sub-chapters. In the first chapter‚ “Perseverance”‚ she explains what was going through her mind during the Inauguration
Premium President of the United States Barack Obama Democratic Party
Determining the unknown concentration of HCl via heat of neutralization of a reaction involving strong electrolytes and weak electrolytes. Myeongwon Lee 20522885 Partner: Frank Wong TA: Afsoon CHEM 120L – Earth Science & Chem 149 Section: 004 Tuesday‚ November 26th‚ 2013 Introduction All chemical changes are accompanied by change in energy and this energy is in form of heat. The energy change of a reaction that happens at constant pressure is defined as heat of reaction or enthalpy change and the
Premium Chemistry Chemical reaction Thermodynamics
Buchenwald Concentration Camp The Buchenwald Concentration Camp was a concentration camp that the Germans used for practically labor of the prisoners until they died or were killed by the SS. Hitler who was the Nazi leader wanted all the people that weren’t the Aryan race to die because they were not perfect. “The Buchenwald camp was located in Weimar Germany and was established in 1937. The main camp was constructed in a wooded area in the northern slopes of Ettersburg. Before the Nazi takeover
Premium Nazi Germany Adolf Hitler Auschwitz concentration camp