ACADEMIA @ UCI
The goal of this experiment is to find the intensity of a desk lamp measured by a photometer then comparing the
intensity to the distance between the light source and the photometer.
Describe the apparatus and procedures used in this section.
Notes on procedure should
include the kind of specifications that would help you repeat the experiment and confirm its results long after
you performed it (e.g. is your desk lamp set on low or high?
Does the laser require careful positioning to
achieve a maximum reading on the photometer?
Referring to the Physics 3LC lab manual (page 14) for the set up procedure.
Desk lamp set on low, digital
multi-meter set on 2-V.
The background noise that was caused by the desk lamp was found to be 0.0025-V.
The photometer was placed 21-cm from the laser.
On the optical bench, began measuring 10-cm from laser on
optical bench 91.5-cm.
Laser had lined up exactly where optical bench ruler was.
The photometer was raised
10.5-cm from the base.
*DRAW DIAGRAM OF THE EXPERIMENTAL SETUP!
DATA AND ANALYSIS:
Lamp Intensity (volts)
Raw, Normalized, Theory
Laser Intensity (volts)
0.94, 2.23, 9, 3
0.76, 1.81, 2.25, 2
0.42, 1.0, 1.0, 1.0
0.26, 0.62, 0.56. 0.75
0.17, 0.40, 0.36, 0.6
0.13, 0.28, 0.25, 0.5
0.10, 0.23, 0.18, 0.42
- For the LAMP DATA, plot the NORMALIZED values on GRAPH paper ( to be torn from the