Physics307L F09:People/Gibson/Notebook/071203

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Speed of light w/ Matt, Zane and Koch

  • Triggering on channel 2 (TAC), 100 mV rising.
  • PMT maximized about 50 cm away from LED, value = 3.30 +/-0.02
  • TAC is on 50 ns scale
  • averaging 128
  • 500 mV / division channel 1
  • 200 mV / division channel 2
stick reading (cm)  TAC (V)  PMT notes (if any)
9       1.47 +/- 0.01
14      1.43 +/- 0.01 
19      1.40 +/- 0.01
24      1.36 +/- 0.01
29      1.33 +/- 0.01
36      1.28 +/- 0.01
39      1.26 +/- 0.01
44      1.22 +/- 0.01
49      1.18 +/- 0.01
54      1.14 +/- 0.01
59      1.10 +/- 0.01



59 cm meter stick
3.30 V PMT 
1.09 V TAC

9 cm meter stick
3.18 V PMT
1.47 V TAC

59 cm meter stick
3.18 V PMT
1.1  V TAC
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