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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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Presentation Transcript
slide2
f
  • Frequency = #of cycles/time
  • Measured in Hertz (Hz)
slide4

3 cycles

2

4

5

6

7

8

9

10

11

12

1

3

Time in seconds

from 0 to 12 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 hz
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 hz
1 cycle in 4 seconds= ¼ Hz

0

2

4

5

6

7

8

9

10

11

12

1

3

Time in seconds

slide9
Period symbol T
  • The time for 1 cycle
the period for 1 wave is 4 seconds t 4
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
What is the frequency?

8

10

14

20

22

24

0

2

4

6

12

16

18

Time in seconds

slide12
?

0 to 24 seconds

3 cycles

8

10

14

20

22

24

0

2

4

6

12

16

18

Time in seconds

slide13

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

slide14
OR
  • Frequency – 1 cycle in x seconds
f 1 cycle in 8 seconds 1 8 hz
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

slide18
#1 f= ?

6

7

8

9

10

0

1

2

3

4

5

11

12

Time seconds

slide19
#2 f= ?

18

20

22

22

24

0

2

6

8

10

12

14

16

26

4

Time seconds

slide20
#3 f = ?

40

45

50

55

5

20

25

30

35

60

65

70

0

10

15

Time seconds

slide21
Check your answers

Check your answers

1 f 1 8 hz
#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
#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
#3 f = 1/20 Hz

40

45

50

55

5

20

25

30

35

60

65

70

0

10

15

Time seconds