Phys 1 Student Workbook.pdf

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Physics Labs with Computers, Vol. 1Student WorkbookP33: Light Intensity vs. Position 012-07000A3. Connect the Rotary Motion Sensor stereo phone plugs to Digital Channels 1 and 2.4. Open the document titled as shown:DataStudio ScienceWorkshop (Mac) ScienceWorkshop (Win)P33 Light vs Position.DS (See end of activity) (See end of activity)• The DataStudio document has a Workbook display. Read the instructions in theWorkbook. The document also has a Graph display of light intensity versus position.• Data recording is set at 20 Hz. The Rotary Motion Sensor is set for 1440 divisions perrotation.5. In the Experiment Setup window,double-click the sensor icon to openthe Sensor Properties window. Clickthe ‘Rotary Motion Sensor’ tab. Clickthe ‘Linear Calibration’ menu andselect ‘Large Pulley (Groove)’. Click‘OK’ to return to the setup window.• See the pages at the end of thisactivity for information aboutmodifying a ScienceWorkshop file.PART II: Equipment Setup and Sensor CalibrationEquipment Setup1. Mount the Light Sensor on the Aperture Bracket and attach the Aperture Bracket to theAperture Bracket Holder. Put the Aperture Bracket Holder onto the Optics Bench about 25cm from one end.2. Rotate the Aperture Disk so the open circular aperture is in line with the opening to theLight Sensor3. Mount the Light Source on the Optics Bench so the ‘point source’ side of the source facesthe Light Sensor.4. Remove the ‘O’ ring from the pulley on the Rotary Motion Sensor. Mount the sensor on asupport rod near the end of the Optics Bench.5. Connect one end of a string to the Aperture Bracket Holder. Put the string over the pulleyon the Rotary Motion Sensor. Attach a mass hanger at the other end of the stringp. 240 ©1999 PASCO scientific P33
Name _____________________ Class ______________ Date _________Sensor Calibration• Calibrate the Light Sensor so that it produces its maximum voltage when the sensor is asclose as possible to the Light Source.1. Turn on the Light Source.2. Set the GAIN select switch on the top of thesensor to 1. Move the Light Source so its port isas close as possible to the Light Sensor.3. In the Experiment Setup window, double-clickthe Light Sensor icon. (The Sensor Propertieswindow opens in DataStudio. The Light Sensorsetup window opens in ScienceWorkshop. InDataStudio click the ‘Calibration’ tab.)4. Check the voltage from the Light Sensor.• Hint: In the DataStudio ‘Calibration’ window,the Current Reading of the voltage from the Light Sensor appears in the upper left corner.In the ScienceWorkshop Sensor Setup window, the current value of the voltage from theLight Sensor appears at the bottom of the column labeled Volts.VoltagefromsensorVoltagefromsensor• If the value of voltage from the sensor is slight higher than 4.9 V, slowly move the LightSource away from the sensor until the value is 4.9 V (or slightly lower).Measure the distance from the Light Sensorrelative to the Light Source.• If the value of voltage from the Light Sensoris less than 4.9 V but more than 0.49 V go tostep #5. If the voltage value is below 0.49 Vset the GAIN switch to 10. If the value isstill below 0.49 V, set the GAIN switch to100.5. Keep this value of voltage as the maximumvalue (corresponding to 100% intensity). In DataStudio click ‘Take Reading’ below the‘High Point’ column. In ScienceWorkshop, click the top Read button. Click ‘OK’ to returnto the Experiment Setup window.P33 ©1999 PASCO scientific p. 241
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Phys 1 Student Workbook.pdf

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