In this experiment the student measures intensity as a function of distance from a point of source and from an extended (5 cm x 5 cm) source. Manipulation of a computer model verifies that for the point source, the intensity drops off like an inverse square. But for the extended source the data cannot be fit by an inverse square relationship.
PASCO Advantage: As the student slides the light sensor away from the Light Source, the Optics Track keeps everything aligned. The Rotary Motion Sensor measures the position, allowing the Intensity vs. Distance graph to be plotted in real time. Students immediately see the relationship between distance and intensity of light.
Designed for use with any of the following
- 850 Universal Interface
- 550 Universal Interface
- Any PASPORT interface with 2 ports
- 1.2 m Optics Track — Basic Optics (OS-8508)
- Basic Optics Light Source (OS-8470)
- Aperture Bracket (OS-8534A)
- Hooked Mass Set (SE-8759)
- PASPORT High Sensitivity Light Sensor (PS-2176)
- PASPORT Rotary Motion Sensor (PS-2120A)
- Dynamics Track Mount (CI-6692)
- Thread, spool
This product requires PASCO software for data collection and analysis. We recommend the following option(s). For more information on which is right for your classroom, see our Software Comparison: SPARKvue vs. Capstone »
This product requires a PASCO Interface to connect to your computer or device. We recommend the following option(s). For a breakdown of features, capabilities, and additional options, see our Interface Comparison Guide »