The Period of a Recording Timer

The Period of a Recording Timer Problem What are the period and frequency of a recording timer? Materials recording timer power supply approximately 2 m of ticker tape carbon paper disk stopwatch Procedure 1. Connect the timer to the power supply. 2. Set up the carbon paper (carbon side down) and ticker tape. 3. Start the timer. 4. One person starts timing when another person starts pulling the ticker tape. 5. Stop timing when the ticker tape leaves the timer. Observations Number of dots: 128 dots Time (in seconds): 1.69 seconds Calculations T= sdots f=dotss

=1.69s128 dots =128 dots1.69s

= 0.013s/dot = 75.7dots/s

Discussion Questions

1.

Range: 0.011s/dot to 0.015 s/dot
Range: 0.011s/dot to 0.015 s/dot
2. T=0.013s/dot
0.013s/dot x 18% = 0.00234s/dot 0.013s/dot + 0.00234s/dot = 0.015s/dot 0.013s/dot – 0.00234s/dot = 0.011s/dot

3. f=75.7dots/s
Range: 62.1 dots/s to 89.3 dots/s
Range: 62.1 dots/s to 89.3 dots/s 75.7dots/s x 18% = 13.626 dots/s 75.7dots/s + 13.626 dots/s = 89.3 dots/s 75.7dots/s – 13.626 dots/s = 62.1 dots/s

4. Yes, because the period/frequency is constantly changing and the period/frequency calculated is only the average.

5. About 76 dots represent 1 s.

Conclusion

The period of the timer is 0.013s/dot, and the frequency is 75.7