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Spectroscopy Activity

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Spectroscopy Activity. http://solar-center.stanford.edu/activities/cots.html. COLORS OF THE SUN ... Solar. Hydrogen. Helium. Sodium. Calcium. Mercury. Neon ... – PowerPoint PPT presentation

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Title: Spectroscopy Activity


1
COLORS OF THE SUN
  • Spectroscopy Activity
  • http//solar-center.stanford.edu/activities/cots.h
    tml

2
What is Spectroscopy?
3
Build a Spectroscope
4
1. Cut out pieces fold
  • Cut along all of the red lines to separate the
    pieces of the spectroscope. You should now have 8
    pieces
  • Spectroscope body
  • Gap Edge
  • Spacers(2)
  • Diffraction Grating
  • Eyepiece
  • Numbered Scale
  • Scale Cover
  • Write your name on the colored side of the
    spectroscope body where it say This spectroscope
    belongs to

5
2. Assemble Spectroscope Body
  • With the black side up, use a straight edge to
    crease the spectroscope body along each of the
    grey dashed lines. Then fold the spectroscope
    body closed (with black side in). Put flap B over
    flap A so they overlap and tape edge as shown

6
3. Form wide scale side of Spectroscope
  • On the wide, open side there are two long flaps
    labeled flap C and flap D. Fold down flap D then
    fold down flap C over it. Tape flap C as shown.
    Then fold down the small end tab and tape corners
    as shown.

7
4. Finish end of spectroscope
  • Fold down the end tabs, then fold Flap C down
    over the end tabs as shown. Tape the corners of
    the end as shown.

8
5. Make entrance slit
  • Light must enter the spectroscope through a gap
    formed between flap C and the gap edge. The gap
    is called the entrance slit. READ CAREFULLY it
    is important for the gap to be straight and
    narrow, so you will need to use the spacers.
    Stack both spacers and sandwich them between flap
    C and the gap edge as shown. Hold the gap edge
    tight against the spacers and tape on the
    spectroscope. Then remove the spacers from the
    gap. You should be able to see through the slit
    and it should be two thicknesses of the poster
    paper. Note the slit will be a little
    off-center but this is O.K.

9
6. Align attach grating and eyepiece
  • At the narrow end of the spectroscope, fold the
    end tabs to form a square opening and tape as
    shown. Next, cover the square opening with the
    diffraction grating. Before taping, make sure
    your diffraction grating is aligned so that the
    word Warning is facing out and cover the
    Warning on the bottom end tab. Tape the
    correctly aligned grating securely in place.
    Tape the eyepiece over the grating with the
    Warning aligned.

10
7. Position scale
  • Place the numbered scale so it covers the open
    side of the spectroscope. When viewed through
    the eyepiece, the 3000 end should be closest to
    the slit. DO NOT TAPE UNTIL STEP 8. Holding the
    scale in place while looking through the
    eyepiece, aim the spectroscope so you can see a
    fluorescent light through the slit. (It must be a
    fluorescent light, an incandescent light bulb
    will not work) You will se colored lines on the
    scale these are spectral lines. If the
    spectral lines appear above the slit instead of
    over the scale, rotate the diffraction grating ¼
    turn.

11
8. Calibrate spectroscope
  • Slide scale back and forth until dashed line at
    5450Ã… is aligned with green spectral line from
    fluorescent lamp. The tape scale in place.
    Finally place scale cover over the scale and tape
    it only along the top edge. That way you can
    lift the scale cover if it is too dark to read
    the scale.

12
Congratulations!
  • Your spectroscope is fully operational. Look at
    various sources of light with your spectroscope.
    NEVER LOOK DIRECTLY AT THE SUN. (and if you do,
    dont do it with your remaining eye)

13
Activities
  • Look at various sources of light and draw the
    spectrum that you see on the provided worksheet.
  • Some suggestions are
  • Fluorescent lamps
  • Light bulbs
  • TVs or computers
  • A white object in sunlight
  • A colored object in sunlight
  • The Moon

14
Appendix A Sample Spectra
  • Solar
  • Hydrogen
  • Helium
  • Sodium
  • Calcium
  • Mercury
  • Neon
  • Argon
  • Water

15
Appendix B How does it work?
16
Appendix C What is diffraction?
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