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### Education

Strayer,Phoniex,
Feb-1999 - Mar-2006

Strayer,Phoniex,University of California
Feb-1999 - Mar-2006

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Category > Physics Posted 04 Sep 2017 My Price 8.00

### The Photoelectric Effect

Physics Lab 6

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The Photoelectric Effect

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

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

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

В·В В В В В В В В  Increase the intensity to 50%

В·В В В В В В В В  Check the box вҖңelectron energy vs. light frequencyвҖқ.

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

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

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

 Metal Wavelength (nm) Frequency (Hz) Energy (J) Energy (eV) Sodium В В В В Zinc В В В В Copper В В В В Platinum В В В В Calcium В В В В

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 Metal Threshold Frequency (Hz) Sodium В Zinc В Copper В Platinum В Calcium В

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

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 Metal Work Function (J) Work Function (eV) Sodium В В Zinc В В Copper В В Platinum В В Calcium В В

6.В В В  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.В  Calculate the work function for each of the metals in joules and electron-volts using the threshold frequencies for each metal.

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

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

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В·В В В В В В В В  Check the box вҖңcurrent vs light intensityвҖқ.

В·В В В В В В В В  Select the metal platinum.

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

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

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

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

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13.В  WhatвҖҷs the relationship between the frequency of the incident photon, threshold frequency and the ejection of electrons?

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14.В  WhatвҖҷs the relationship between the energy of the incident photon, the work function and the ejection of electrons?

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15.В  WhatвҖҷs the relationship between the kinetic energy of the ejected electrons, the energy of the incident photon and the work function?

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16.В  WhatвҖҷs the relationship between the intensity of the incident light and the average kinetic energy of the ejected electrons?

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17.В  WhatвҖҷs the relationship between the intensity of the incident light and the number of the ejected electrons?

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