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Period & Frequency Ch. 25.1 – 25.2.

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Presentation on theme: "Period & Frequency Ch. 25.1 – 25.2."— Presentation transcript:

1 Period & Frequency Ch – 25.2

2 Wave Repeating disturbance or movement that transfers energy through matter or space Periodic motion What types of objects/source cause transfer of energy through waves?

3 Waves and Energy Waves carry energy not matter!
Waves travel only as long as they have energy to carry Wave intensity decreases with distance from the original source of energy

4 Period Time for a back and forth swing Example: pendulum
Directly proportional to the square root of the length and inversely proportional to the acceleration due to gravity T= 2π√(L/g) Does not depend on mass

5 Practice Question: Which has a longer period: a long pendulum or a short pendulum? Long pendulum

6 Frequency: how often a vibration occurs
Measured in hertz (Hz) Frequency and period are inversely proportional to each other Frequency = 1 / period Period = 1 / frequency

7 Practice Question: If the period of the vibration is 2 seconds, what is the frequency? Frequency = 1 / period Frequency = 1 / 2 = ½ Hz

8 Practice Problem 2 100 waves pass a dock in 10 seconds. What is the frequency of the wave? f = number of waves/second = 100/10= 10 Hz What is the period of the wave? period= time for one wave = 10/100= 0.1 seconds


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