72
G
ETTING
S
TARTED WITH THE
CBL 2™ S
YSTEM
© 2000, 2003 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Part 2
For the second part of this experiment, you will point the light sensor at a single
fluorescent light bulb and record its intensity for a very short period of time. The
resulting plot of intensity vs. time is interesting because it shows that fluorescent
lights do not stay on continuously but rather flicker off and on very rapidly in a
periodic way. Since the human eye cannot distinguish between flashes that occur
more than about 50 times a second, the light appears to be on all the time. The
data you collect will be used to determine the period and frequency at which the
bulb flickers.
Set up the experiment
1.
Make sure the TI light sensor is connected to CH1 of the CBL 2.
2.
Run the DataMate program or app.
3.
Press
À
SETUP to go to the Setup screen.
4.
Press
}
or
†
to move the cursor to MODE and then press
Í
.
