ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAEAF
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Line Emission Spectra worksheetName
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Open the simulation You may find it useful to use a second display if you have one available or work with two separate tab windows.
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https://ophysics.com/m1.html
Microsoft excel version of this worksheet if needed (follow the link to find out how if you don't know how!)
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⇩ (Column in spreadsheet)
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1. Set the "from level" to 7 on the simulation
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B2. Record the energy level (-0.278 eV) [eV stands for "Electron volts" 1 eV = 1.6x10^-19 Joules]
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3. Set the "to level" to 6
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4. Record the energy level (-0.378 eV)
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(The spreadsheet will convert these energy levels in electron volts to Joules in columns E and F)
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5. Calculate the energy difference in Joules (from level - to level) (technically should be a negative number but not needed here)
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6. Calculate the frequency of light emitted in Hz using E= hf where h = 6.63x10^-34 Js
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7. Calculate the wavelength of light using λ=v/f The colour of light emitted will appear in the box as you type your answer!
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J8. Convert the wavelength to nm by multiplying by 1x10^9 The colour of visible light emitted will appear in the box after you have typed in your answer!
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The first line has been completed as an example for you to check your answers before calculating the other rows
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BDEFGHIJ
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From levelTo levelFrom levelTo levelEnergy differencefrequency of light f=E/hwavelength λ= v/fwavelength λ
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(eV)(eV)(J)(J)(J)(Hz)(m)(nm)
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7-0.2786-0.378-4.45E-20-6.06E-201.60E-202.42E+131.24E-0512,398Infra red
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750.00E+000.00E+00Infra red
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620.00E+000.00E+00
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520.00E+000.00E+00This simulation was developed by Tom Walsh using the https://www.geogebra.org/ graphing package and is hosted on his website https://ophysics.com/. My thanks to Tom and the team at Geogebra for making these resources freely available for the benefit of Physics students
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420.00E+000.00E+00
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320.00E+000.00E+00
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Now to plot the Line emission spectrum in the drawing frame
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9. Double click on the image on the right with title "Move each of the .." to allow editing, then click save and close.
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Compare your spectrum with a real spectrum
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10. Click insert/image/image over cells
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11. Select Google image search
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with keywords:
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hydrogen visible emission spectrum
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12. Paste the image you feel best fits your 'results'
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13. "Hand in" this spreadsheet
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Try this interactive from Pasco to simulate an absorption spectrum using the wavelengths you have calculated
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13. Open the link to thea Pasco eBook:
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http://student.pasco.com/epub/Physics/eBook-SB/BookInd-892.html
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14. you will need to copy and paste the access code
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NGSS58653-EP3-SB-0720-M5UJJ
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15. and follow the link to the page again
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http://student.pasco.com/epub/Physics/eBook-SB/BookInd-892.htmlBDEFGHIJ
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16. Run the interactive simulation at the bottom of the page
From levelTo levelFrom levelTo levelEnergy differencefrequency of light f=E/hwavelength λ= v/fwavelength λ
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17. Adjust the wavelength to one of the values you calculated and click 'run'.
yes, same direction
e(V)(eV)(J)(J)(J)(Hz)(m)(nm)
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You should see the electron move and a re-emit a photon
no, emitted in different directions
7-0.2786-0.378-4.45E-20-6.06E-201.60E-202.42E+131.24E-0512,398
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18. Do the re-emitted photons travel in the same direction as the absorbed photon?
Not sure7-0.2785-0.544-4.45E-20-8.72E-204.26E-206.43E+134.66E-064,661
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6-0.3782-3.4-6.06E-20-5.45E-194.84E-197.31E+144.10E-07410
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5-0.5442-3.4-8.72E-20-5.45E-194.58E-196.91E+144.34E-07434
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4-0.852-3.4-1.36E-19-5.45E-194.09E-196.17E+144.86E-07486
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3-1.5112-3.4-2.42E-19-5.45E-193.03E-194.57E+146.56E-07656
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