Determining wave frequency from a graph

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# Determining wave frequency from a graph - PowerPoint PPT Presentation

Determining wave frequency from a graph. f. Frequency = #of cycles/time Measured in Hertz (Hz). 1 cycle = 1 full wave to repeat itself. 3 cycles. 2. 4. 5. 6. 7. 8. 9. 10. 11. 12. 1. 3 . Time in seconds . from 0 to 12 seconds. 0. 2. 4. 5. 6. 7. 8. 9. 10. 11. 12. 1.

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## Determining wave frequency from a graph

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Presentation Transcript

### Determining wave frequency from a graph

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

3 cycles

2

4

5

6

7

8

9

10

11

12

1

3

Time in seconds

from 0 to 12 seconds

0

2

4

5

6

7

8

9

10

11

12

1

3

Time in seconds

f=3/12 s = ¼ Hz

2

4

5

6

7

8

9

10

11

12

1

3

Time in seconds

1 cycle in 4 seconds= ¼ Hz

0

2

4

5

6

7

8

9

10

11

12

1

3

Time in seconds

Period symbol T
• The time for 1 cycle
The period for 1 wave is 4 seconds T=4

2

4

5

6

7

8

9

10

11

12

1

3

Time in seconds

What is the frequency?

8

10

14

20

22

24

0

2

4

6

12

16

18

Time in seconds

?

0 to 24 seconds

3 cycles

8

10

14

20

22

24

0

2

4

6

12

16

18

Time in seconds

3/24 s= 1/8 Hz

0 to 24 seconds

3 cycles

8

10

14

20

22

24

0

2

4

6

12

16

18

Time in seconds

OR
• Frequency – 1 cycle in x seconds
f=1 cycle in 8 seconds= 1/8 Hz

8

10

14

20

22

24

0

2

4

6

12

16

18

Time in seconds

#1 f= ?

6

7

8

9

10

0

1

2

3

4

5

11

12

Time seconds

#2 f= ?

18

20

22

22

24

0

2

6

8

10

12

14

16

26

4

Time seconds

#3 f = ?

40

45

50

55

5

20

25

30

35

60

65

70

0

10

15

Time seconds

#1 f= 1/8 Hz

6

7

8

9

10

0

1

2

3

4

5

11

12

Time seconds

#2 f= 1/8 Hz

18

20

22

22

24

0

2

6

8

10

12

14

16

26

4

Time seconds

#3 f = 1/20 Hz

40

45

50

55

5

20

25

30

35

60

65

70

0

10

15

Time seconds