Assignment

Students have been given a photocell attached to a voltmeter which measures the voltage output of the photocell. A spectrum is projected onto a ruler as shown and at various positions along the ruler the intensity of the light from the spectrum is measured with the photocell

The voltage output is proportional to the intensity of the light that illuminates it.

By moving the detector across the spectrum the voltage produced by the photocell is recorded at each position along the spectrum, as illustrated to the left.

Assignment:

Using the data collected in the chart below, plot the intensity (voltage) against the recorded position (on the ruler) to build a spectrogram (chart) of the observed spectrum.

Recorded Data

detector position (mm) recorded voltage
300 0.0
320 3.0
350 7.0
360 5.0
370 7.0
380 9.5
390 9.0
395 10.5
410 2.0
420 8.0
425 7.0
440 11.5
450 10.0
detector position (mm) recorded voltage
470 15.0
500 6.0
520 9.0
530 5.0
550 8.0
590 3.0
595 4.0
600 2.0
610 3.5
620 1.0
625 2.5
650 1.0
660 0.5
665 0.0

key

[Home]

Prepared by YES I Can! Science
Faculty of Pure and Applied Science, York University