(COMPUTER VARIANT)
The aim: definition of wave length λ ruled spectrum.
Instrumentation and appliances: computer; computer programm dr.
Order of performance
1. Choose gap d1 or d2. Enter this value using push button switch (d1 or
d2 , while d1 less the d2).
2, Display the standard range. Push the button Standard.
The diffraction pattern with a ruler define the diffraction angles far the first three positive and negative orders. To move the ruler put the cursor outside the frame and press the left button of the mouse.
3. Measure with a ruler distance x1 between the central and 1,2,3 maximum. The main peaks formula calculate its diffraction grating period for all three orders. Write the average result. Wave length of standard source is 640 nm.
4. Define lattice constant based on the formula
d xk = k λ L where=1, 2, 3 order diffraction maximum,
L=1m distance from the slit to the screen,
λ=640 nm wavelength.
To do it push the button spectr. This measuring contains 4 spectral lines with different wavelengths.
5. Display lined spectrum. With ruler define the diffraction angles for all 4 spectral lines in 2 positive and 2 negative spectrum orders. Pay attention on the overlap of the diffraction spectra of large orders.
6. Measure the distance with a ruler xk for blue, green, yellow and red lines. Calculate the wavelengths of spectral lines by the formula of major maxima. Grating period d was determined earlier.
Do calculation for the first and second orders for each spectral line. Write average result.
- Based on the formula (1) determine the wavelengths of these lines.
For guidance teacher enter another value grating period by pressing the appropriate button. Then, fully do all the experiments described above for this case.
8. Explore continuous spectrum.
Push the button continuous. A diffraction spectrum for an ordinary white light will appear. Watch as colors in spectrum of small orders alternate. Pay attention on the overlapping spectra of large orders. How will spectrum change for another meaning d?
- Make conclusion.
Authors: Serpetsky B.A., the reader, candidate of physical and mathematical sciences.
Reviewer: Loskutov S.V., professor, doctor of physical and mathematical sciences.
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