Determining wave frequency from a graph

1. Determining wave frequency
from a graph

2. f
•Frequency = #of cycles/time
•Measured in Hertz (Hz)

3. • 1 cycle = 1 full wave to
repeat itself

4. 3 1 2 4 5 6 7 8 9 10 1112
Time in seconds
3 cycles

5. from 0 to 12 seconds
3 1 2 4 5 6 7 8 9 10 1112
Time in seconds
0

6. f=3 /12 s = ¼ Hz
3 1 2 4 5 6 7 8 9 10 1112
Time in seconds

7. •Or determine the time for 1 full wave cycle

8. 1 cycle in 4 seconds= ¼ Hz
3 1 2 5 6 7 8 9 10 1112
Time in seconds
0 4

9. •Period symbol T
•The time for 1 cycle

10. The period for 1 wave is 4
seconds T=4
3 1 2 4 5 6 7 8 9 10 1112
Time in seconds

11. What is the frequency?
0 2 4 6 8 10 12
14
1618 20
Time in seconds
2224

12. ?
0 2 4 6 8 10 12
14
1618 20
Time in seconds
22 24
3 cycles 0 to 24 seconds

13. 0 2 4 6 8 10 12
14
1618 20
Time in seconds
22 24
3 cycles 0 to 24 seconds
3/24 s= 1/8 Hz

14. OR
•Frequency – 1 cycle in x seconds

15. f=1 cycle in 8 seconds= 1/8 Hz
0 2 4 6 8 10 12
14
1618 20
Time in seconds
2224

17. • On a piece of paper
number 1 through 3 and
determine the frequency
of the following waves.

18. #1 f= ?
01 2 3 4 5 67 8 9101112
Time seconds

19. #2 f= ?
Time seconds
02 4 68 10121416182022222426

20. #3 f = ?
0 5 101520253035
40455055606570
Time seconds

21. •Check your answers

22. #1 f= 1/8 Hz
01 2 3 4 5 67 9101112
Time seconds
8

23. #2 f= 1/8 Hz
Time seconds
02 4 6 101214161820222224268

24. #3 f = 1/20 Hz
0 5 1015
253035
40455055606570
Time seconds
20