74
G
ETTING
S
TARTED WITH THE
CBL 2™ S
YSTEM
© 2000, 2003 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Student Data Reporting Sheet 2
1.
Make a sketch of your data. Label the axes.
From the intensity versus time graph on your calculator, it appears that light
intensity values are rising and falling in a regular pattern. What do the peaks or
maximum values on your data set represent in terms of the flashing bulb? What
do the minimum values represent?
2.
To calculate the average period of the bulb's flicker, find the average time
interval between the first and last peaks. (The calculator should now be in Trace
Mode.) Use the arrow keys to move the cursor to the apparent maximum of the
first peak. The
x
-value at the bottom of the screen represents the time when this
maximum occurred. Record this value below.
A = ____________________ seconds
3.
Next, move the cursor to the maximum of the last peak on the graph. Record
this value below.
B = ____________________ seconds
4.
From the first peak, count the number of peaks to the last one. Record that
value below.
C = ____________________ peaks
(At this point, you can press
Í
and then press
¸
to quit the program.)
5.
Subtract A from B and then divide by C,
(B-A)
C to find the average time period.
Record this value below.
Period: ____________________ seconds
