1. Test Review

2. The ____ is a force that always acts to pull an oscillator back toward the center position. Restoring force

3. When the frequency of a periodic force matches the natural frequency of the oscillating system, ____ occurs. resonance

4. The number of cycles an oscillator makes per second is called the ____
The number of cycles an oscillator makes per second is called the ____. frequency

5. The ____ of an oscillator describes where it is in the cycle. phase

6. Friction causes ____ in an oscillator. damping

7. Swinging motion (back and forth motion that repeats) is an example of a ____. Harmonic motion

8. ____ describes the size of a cycle. Amplitude

9. The time it takes for one cycle is called the ____. period

10. The low point of a wave is called its:
trough

11. The lowest natural frequency of an object is known as the ____ frequency.
fundamental

12. Multiples of the natural frequency are called ____. harmonics

13. When waves bounce off an obstacle and change direction, it is known as ____. reflection

14. A wave bending around obstacles and going through openings is called ____. diffraction

15. Using a heavy curtain in a theater to keep the audience from hearing backstage sound is an example of the ____ of sound waves. absorption

16. Two waves meeting and cancelling each other out is called ____
Two waves meeting and cancelling each other out is called ____. Destructive interference

17. Two waves meeting and adding up to a larger wave is called ____
Two waves meeting and adding up to a larger wave is called ____. Constructive interference

18. A speaker vibrates at a frequency of 200 Hz. What is its period
A speaker vibrates at a frequency of 200 Hz. What is its period? seconds

19. A pendulum has a period of 0.3 second. What is its frequency? 3.33 Hz

20. An oscillator makes 360 vibrations in 3 minutes. What is its period
An oscillator makes 360 vibrations in 3 minutes. What is its period? 0.5 seconds

21. A wave has a speed of 50 m/sec and a frequency of 10 Hz
A wave has a speed of 50 m/sec and a frequency of 10 Hz. Calculate its wavelength. 5 meters

22. A wave has a period of 2 seconds and a wavelength of 4 meters
A wave has a period of 2 seconds and a wavelength of 4 meters. Calculate its frequency. 0.5 Hz

23. An oscillator makes 360 vibrations in 3 minutes. What is its frequency
An oscillator makes 360 vibrations in 3 minutes. What is its frequency? 2 Hz