determining wave frequency from a graph. f frequency = #of cycles/time measured in hertz (hz)
TRANSCRIPT
Determining wave frequency from a graph
f
• Frequency = #of cycles/time
• Measured in Hertz (Hz)
• 1 cycle = 1 full wave to repeat itself
3 1 2 4 5 6 7 8 9 10 11 12
Time in seconds
3 cycles
from 0 to 12 seconds
3 1 2 4 5 6 7 8 9 10 11 12
Time in seconds
0
f=3 s = ¼ Hz
3 1 2 4 5 6 7 8 9 10 11 12
Time in seconds
• Or determine the time for 1 full wave cycle
1 cycle in 4 seconds= ¼ Hz
3 1 2 5 6 7 8 9 10 11 12
Time in seconds
0 4
• Period symbol T
• The time for 1 cycle
The period for 1 wave is 4 seconds T=4
3 1 2 4 5 6 7 8 9 10 11 12
Time in seconds
What is the frequency?
0 2 4 6 8 10 12 14 16 18 20
Time in seconds
22 24
?
0 2 4 6 8 10 12 14 16 18 20
Time in seconds
22 24
3 cycles 0 to 24 seconds
0 2 4 6 8 10 12 14 16 18 20
Time in seconds
22 24
3 cycles 0 to 24 seconds3/24 s= 1/8 Hz
OR
• Frequency – 1 cycle in x seconds
f=1 cycle in 8 seconds= 1/8 Hz
0 2 4 6 8 10 12 14 16 18 20
Time in seconds
22 24
• On a piece of paper number 1 through 3 and determine the frequency of the following waves.
#1 f= ?
0 1 2 3 4 5 6 7 8 9 10 11 12
Time seconds
#2 f= ?
Time seconds
0 2 4 6 8 10 12 14 16 18 20 22 22 24 26
#3 f = ?
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
Time seconds
• Check your answers
#1 f= 1/8 Hz
0 1 2 3 4 5 6 7 9 10 11 12
Time seconds
8
#2 f= 1/8 Hz
Time seconds
0 2 4 6 10 12 14 16 18 20 22 22 24 268
#3 f = 1/20 Hz
0 5 10 15 25 30 35 40 45 50 55 60 65 70
Time seconds
20
