AccountingQueen

(3)

$16/per page/Negotiable

About AccountingQueen

Levels Tought:
Elementary,Middle School,High School,College,University,PHD

Expertise:
Accounting,Algebra See all
Accounting,Algebra,Applied Sciences,Architecture and Design,Art & Design,Biology,Business & Finance,Calculus,Chemistry,Communications,Computer Science,Economics,Engineering,English,Environmental science,Essay writing,Film,Foreign Languages,Geography,Geology,Geometry,Health & Medical,History,HR Management,Information Systems,Law,Literature,Management,Marketing,Math,Numerical analysis,Philosophy,Physics,Precalculus,Political Science,Psychology,Programming,Science,Social Science,Statistics Hide all
Teaching Since: Jul 2017
Last Sign in: 279 Weeks Ago, 4 Days Ago
Questions Answered: 5502
Tutorials Posted: 5501

Education

  • MBA.Graduate Psychology,PHD in HRM
    Strayer,Phoniex,
    Feb-1999 - Mar-2006

  • MBA.Graduate Psychology,PHD in HRM
    Strayer,Phoniex,University of California
    Feb-1999 - Mar-2006

Experience

  • PR Manager
    LSGH LLC
    Apr-2003 - Apr-2007

Category > Physics Posted 04 Sep 2017 My Price 8.00

The Photoelectric Effect

Physics Lab 6

 

 

The Photoelectric Effect

 

This lab will investigate the photoelectric effect.  The photoelectric effect is the emission of electrons from a surface when illuminated with light of a certain frequency.  The first insight to understanding this phenomenon was presented in 1900 by Max Planck.  His formula, E = hf, related the energy of a photon to its frequency.  Albert Einstein extended this idea of quantized photonic energy to a stream of photons (electromagnetic radiation) and explained the photoelectric effect. 

 

1.    Go to http://phet.colorado.edu/simulations/sims.php?sim=Photoelectric_Effect and launch the simulation.

2.    Make the following adjustments to the simulation once it has launched.

·         Increase the intensity to 50%

·         Check the box “electron energy vs. light frequency”.

Once these adjustments have been made you should notice the ejection of elections from the surface.

3.    Increase the wavelength of the light until electrons are no longer ejected.  Record the wavelength in the table below and complete the calculations.  1 electron-volt (eV) = 1.6 X 10-19 J

4.    Repeat the above step for each of the metals under the pull down menu.

Metal

Wavelength (nm)

Frequency

(Hz)

Energy

(J)

Energy

(eV)

Sodium

 

 

 

 

Zinc

 

 

 

 

Copper

 

 

 

 

Platinum

 

 

 

 

Calcium

 

 

 

 

 

 

 

 

 

 

 

Metal

Threshold Frequency (Hz)

Sodium

 

Zinc

 

Copper

 

Platinum

 

Calcium

 

5.    The minimum frequency of a photon that can eject an electron from a surface is called the threshold frequency, ft.  What is the threshold frequency, ft, for each of the metals?

 

 

 

 

 

Metal

Work Function

(J)

Work Function (eV)

Sodium

 

 

Zinc

 

 

Copper

 

 

Platinum

 

 

Calcium

 

 

6.    The minimum amount of energy required for an electron to escape from a metal is called the work function, W, and is given by the equation W = hft.  Calculate the work function for each of the metals in joules and electron-volts using the threshold frequencies for each metal.

·    h = 6.63 X 10-34 Js or h = 4.14 X 10-15 eVs

7.    When an electron is ejected from the surface, what type of energy does the electron possess?

 

8.    Make the following additional adjustments to the simulation.

·         Check the box “current vs light intensity”.

·         Select the metal platinum.

9.    Adjust the frequency of the incident light slightly above the threshold frequency.

10.  Vary the intensity of the light and observe any changes in the number of ejected electrons.

11.  Increase the frequency of the incident light until it is well above the threshold frequency.

12.  Vary the intensity of the light and observe any changes in the number of ejected electrons.

 

13.  What’s the relationship between the frequency of the incident photon, threshold frequency and the ejection of electrons?

 

14.  What’s the relationship between the energy of the incident photon, the work function and the ejection of electrons?

 

15.  What’s the relationship between the kinetic energy of the ejected electrons, the energy of the incident photon and the work function?

 

16.  What’s the relationship between the intensity of the incident light and the average kinetic energy of the ejected electrons?

 

17.  What’s the relationship between the intensity of the incident light and the number of the ejected electrons?

 

 

Answers

(3)
Status NEW Posted 04 Sep 2017 03:09 PM My Price 8.00

Hel-----------lo -----------Sir-----------/Ma-----------dam----------- T-----------han-----------k y-----------ou -----------for----------- us-----------ing----------- ou-----------r w-----------ebs-----------ite----------- an-----------d a-----------cqu-----------isi-----------tio-----------n o-----------f m-----------y p-----------ost-----------ed -----------sol-----------uti-----------on.----------- Pl-----------eas-----------e p-----------ing----------- me----------- on----------- ch-----------at -----------I a-----------m o-----------nli-----------ne -----------or -----------inb-----------ox -----------me -----------a m-----------ess-----------age----------- I -----------wil-----------l

Not Rated(0)