HEISENBERG UNCERTAINTY PRINCIPLE EXPERIMENT
ANALYSIS OF DATA:
๐ ๐ ๐๐๐ = ๐๐ ๐ = 1, 2,3, โฆ ๐ท๐๐๐ ๐น๐๐๐๐๐ (1)
๐ ๐ ๐๐๐ = (๐ + 1
2) ๐ ๐ = 1,2, 3, โฆ๐ต๐๐๐โ๐ก ๐น๐๐๐๐๐ (2)
Part I) Single Slit Diffraction:
1. If you are going to use dark points, use Equation 1; if you are going to use bright points, use
Equation 2.
2. In these equations, find sinฮธ by using the distance between the sensor and the laser source,
"L", and the distance of the bright or dark fringe from the centripetal illumination, "y".
3. Record the positions of the bright and dark fringes, 3 on the right side and 3 on the left side
of the centripetal illumination, and the sinฮธ values for these positions in Table 1.
4. Take the average of the wavelength ฮป values you found using Equation 1 or 2.
5. Compare the theoretical wavelength with what you found and calculate the error.
6. Draw the n-sinฮธ graph and calculate the slit width from the slope of this graph, compare it
with the value written on the slit.
Part II) Double Slit Diffraction:
Repeat the same steps as in the Single Slit Diffraction part and fill in Table 2 for this part.
Part I) Single Slit Diffraction: ๐ณ =
๐
๐ป๐๐๐๐๐๐ =
๐๐ป๐๐๐๐๐๐ =๐๐๐ ๐๐
TABLE 1
n
Dark Fringes
Bright Fringes
y
(mm)
๐๐๐๐ฝ = ๐โ(๐ณ๐+๐๐)
โ
ฮป
(nm)
y
(mm)
๐๐๐๐ฝ = ๐โ(๐ณ๐+๐๐)
โ
ฮป
(nm)
-3
-2
-1
0
1
2
3
๐๐๐๐
(nm)
๐๐๐๐
(nm)
% Error:
Slope = d =
% Error:
