Nobody downloaded yet

Quantum and Thermochemical Structure lap report - Assignment Example

Comments (0) Cite this document
Summary
Laboratory 1: Photoelectric Effect Abstract: The obtained value for the work function (k1) of Cesium was 3.3448 x 10-19 Joules which matches the literature equivalent of 3.4286 x 10-19 Joules. The k2 constant calculated having a value of 8.3632 x 10 -34 J-s, however, was not as close to the expected Planck’s constant of 6.626 x 10-34…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER97.3% of users find it useful
Quantum and Thermochemical Structure lap report
Read TextPreview

Extract of sample
"Quantum and Thermochemical Structure lap report"

Download file to see previous pages Because of the difficulty of maintaining clean metal surfaces under vacuum, quantitative measurements of the photoelectric effect could not be made for many decades. However, as technology improved, it became evident that the energy of ejected electrons was not related to the intensity of the light waves used, and also that below a certain light frequency - for a given material - no electrons at all could be ejected. Eventually it became possible to determine the relationship between the kinetic energy of the ejected electrons and the frequency of light used to eject them, and this was one of the major factors leading to the development of the quantum model. The kinetic energy of photoelectrons (E) can be measured by determining the voltage required to just stop the ejection of electrons (V) and multiplying this by the charge on an electron (e). Equation 1: V (J C–1) x e (1.602 x 10–19 C) = E (J) Experimentally, the dependence of E on frequency turned out to be: Equation 2: E (J) + k1 (J) = k2 (Js) x ? (s–1) Where k1 was different for every metal and k2 was exactly the same for every metal. What’s more, k2 was exactly the same as a ‘fudge factor’ that had been introduced into a theory developed a few years earlier to explain a completely different phenomenon. In this experiment you will carry out solo measurements to determine k1 and k2. Unlike early 20th century researchers, you will not need to spend several years constructing your apparatus from scratch, but will use a demonstration apparatus designed to measure the stopping voltage of electrons ejected from Cs3Sb in a vacuum. Experimental: The EP-05 photoelectric effect apparatus was used to measure the stopping voltage of light at 8 different wavelengths. A modified spectrometer was used t o provide UV-visible light. The wavelengths tested were 400 nm, 425 nm, 450 nm, 475 nm, 500 nm, 525 nm, 550 nm, and 575 nm. The photoelectric apparatus was set up such that the aperture in front of the photodiode was positioned near the light source. The dials with labels “zero” and “voltage” was set to minimum before the shutter was closed. The plotting was initiated using the Lab View window. The voltage dial was set to maximum while the other dial was turned until nanoampere readings reached zero. The voltage dial was set back to minimum before the shutter was opened to increase the nanoampere reading to 10. The voltage dial was maximized once again to recheck that the “zero” dial was adjusted properly. Once everything was set, the stopping voltage was minimized and the plotting of nanoamperes versus stopping voltage was reset and started at the Lab View window. The output current in nanoamperes were determined by slowly turning the voltage dial. The measured current was recorded and then plotted according to its stopping voltage reading. The measurement is ended when the critical value for stopping voltage where there is minimal change in nanoamperes with respect to voltage is achieved. The whole procedure was done for each of the 8 chosen wavelengths. Results: The experiment was done properly and all the needed data were acquired. The numerical values obtained from the use of the apparatus can be found at the attached document. The plot of the graph and the summary of the derived values are the following: Figure1. Compiled plots for output current versus stopping ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Quantum and Thermochemical Structure lap report Assignment”, n.d.)
Retrieved from https://studentshare.org/chemistry/1398834-quantum-and-thermochemical-structure-lap-report
(Quantum and Thermochemical Structure Lap Report Assignment)
https://studentshare.org/chemistry/1398834-quantum-and-thermochemical-structure-lap-report.
“Quantum and Thermochemical Structure Lap Report Assignment”, n.d. https://studentshare.org/chemistry/1398834-quantum-and-thermochemical-structure-lap-report.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document
CHECK THESE SAMPLES - THEY ALSO FIT YOUR TOPIC
Quantum Oscillator Problem
Figure 6.11 shows a plot of the 10th excited state probability density, |ψ10|2. Mathematica has the Hermite polynomials built-in. The quantum oscillator wave functions are given in equation 6.57; these wave functions are not normalized.
1 Pages(250 words)Assignment
Market Structure
Question 1: Describe each market structure discussed in the course (perfect competition, monopolistic competition, oligopoly, and monopoly) and discuss two of the market
8 Pages(2000 words)Assignment
Langauge structure
In language acquisition, we have positive transfer which promotes learning a new language leading to a successful acquisition of a second language. There is also negative transfer, which leads to the formation of unacceptable forms which damage, delay and hinder the acquisition of a second language.
8 Pages(2000 words)Assignment
Artistic and Livelihood Rights versus Morality Issues in Anti-Lap Dancing Ordinance
A coalition of councilmembers and community activists voted on a law that bans touching between entertainers and patrons in any Castaway Beach business, called the anti-lap dancing ordinance. They emphasized that the city’s sex industry harms community health, safety, and morals.
2 Pages(500 words)Assignment
Lap report
This measurement is derived from measuring a covering circle and its distance from the observer, then applying that resulting angular size to the distance to the moon. The result is the moon’s diameter. This measure is calculated twice, once with the moon low on the horizon, and once when it is higher in the sky to test the visual sensation that the moon is larger when on the horizon.
1 Pages(250 words)Lab Report
Lap Dance Feature News Story Prompt
The ordinance bans any kind of physical contact between the entertainers and patrons. Even though it is applicable to all businesses, it is mainly targeted towards the adult entertainment industry. The ordinance was
2 Pages(500 words)Assignment
Creation of a paper on how you would research a business sector and how you would structure a project report
d, ECO Renewable Energy Systems Ltd in Leeds, Eco Surveying Ltd in Aycliffe, MAK Energy Ltd in Wickford, Renewable Energy Services in Stoke-on-Trent, Conduction (UK) Ltd in Derby, Ecovision Systems in Tetbury, All Eco energy Ltd based in Redditch, Eco Home Services Ltd based in
4 Pages(1000 words)Assignment
Electrical & electronic principles ( lap report ) AC power
Part one was completed by carrying out some calculation as displayed in the discussion part. The procedure for this part was a continuation of part one of the
5 Pages(1250 words)Assignment
Electrical & electronic principles ( lap report ) in transistor
The BJT also known as the bipolar Junction transistor junction was introduced in 1948 by the laboratories of Bell Telephone in USA New Jersey. This was produced as the first transistor. BJT is normally used in some analogue and high-frequency application due to their low
5 Pages(1250 words)Assignment
Lap 5
The four smallest planets in the order of smallest to largest are Mercury (4,878km), Mars (6,787km), Venus (12,104) and Earth (12,756km). Earth has a diameter of 12,756km while Jupiter has a diameter of 142,800km hence the ratio of Earth’s diameter to Jupiter’s
1 Pages(250 words)Assignment
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Let us find you another Assignment on topic Quantum and Thermochemical Structure lap report for FREE!
logo footer
Contact us:
+16312120006
Contact Us Now
FREE Mobile Apps:
  • StudentShare App Store
  • StudentShare Google play
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • Miscellaneous
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us