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EXAS
I
NSTRUMENTS
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NCORPORATED
G
ETTING
S
TARTED WITH THE
CBL 2™ S
YSTEM
77
Part 2: Answers based on our sample data.
1.
Peaks correspond to times when the bulb is fully illuminated; minimums
correspond to times when the bulb is momentarily off.
2.
A= .003 seconds
3.
B= .045 seconds
4.
C= 5 peaks
5.
Period is .0084 seconds
6.
Frequency is 119.05 cycles per second
7.
Since the polarity switches twice per cycle, we would expect to observe a
frequency of 120 cycles per second. This is very close to the calculated value,
119.05 cycles per second.
8.
The minimum
y
-value is non-zero due to the presence of background light.
Reference
Real-World Math with the CBL System: Activities for the TI-83 and
TI-83 Plus
: Brueningsen, Bower, Antinone and Brueningsen-Kerner; Activity 15:
Lights Out; TI Explorations Book.