Also, the radius tool needs only three points to define the circle, so even rings that are partially out of view can be measured. PASCO Advantage: In PASCO Capstone software, students can use the video magnifier tool to enlarge the region to see the details of the line splitting. All atomic magnetic moments are integral or half-integral multiples of the Bohr magneton. The pattern may also be viewed along the field axis where the light is circularly polarized.įinally, the pattern that is polarized perpendicular to the field axis is used to calculate the Bohr magneton. A polarizer is used to show the three lines due to light that is polarized parallel to the field axis and to show the six lines that are polarized perpendicular to the field axis. Initially, the light is viewed along an axis perpendicular to the magnetic field axis. The magnetic field is varied from zero to nearly 1 Tesla. In this experiment the student observes the interference pattern form a Fabry-Perot interferometer which results from 546.1 nm spectral line of a mercury lamp immersed in a uniform magnetic field. All the complex calculations for the angle-to-wavelength conversion are stored in the setup file for PASCO Capstone. PASCO Advantage: The light bulb is powered by the interface, making it easy to change its temperature by changing the voltage across the bulb. From the temperature, the theoretical peak wavelength can be calculated and compared to the measured peak wavelength. The temperature of the bulb’s filament can then be measured indirectly by determining the resistance of the bulb from the measured voltage and current. The intensity of the light bulb is reduced, reducing the temperature, and the scan is repeated to show how the curves nest with a shift in the peak wavelength. The relative light intensity can then be plotted as a function of wavelength as the spectrum is scanned, resulting in the characteristic blackbody curve. The wavelengths corresponding to the angles are calculated using the equations for a prism spectrophotometer. A Broad Spectrum Light Sensor is used with a prism so the entire spectrum from approximately 400 nm to 2500 nm can be scanned without the overlapping orders caused by a grating. The spectrum of an incandescent light bulb is scanned by hand using a prism spectrophotometer, which measures relative light intensity as a function of angle. In this experiment designed for use with PASCO Capstone software, the classic blackbody spectrum of light intensity versus wavelength is obtained for a light bulb and the shift in the peak wavelength is demonstrated for different bulb temperatures. The integration of Blockly into SPARKvue and Capstone introduces a streamlined solution, where students can code, debug, and collect and analyse data.