1. May 21st, 2013 What type of wave is a sound wave?
What is included in one wave cycle?

2. Q: What do you mean when you talk about the frequency and period of a wave?
Amount of wave cycles that pass in a certain amount of time
NOT the same as speed of a wave!
f =
cycles
time

3. Q: What do you mean when you talk about the frequency and period of a wave?
Frequency, cont
Units: Hertz, Hz (cycles per second)
Increased frequency means higher “pitch”

4. Q: What do you mean when you talk about the frequency and period of a wave?
The amount of time it takes for one complete cycle (wavelength)
Units: same as for time (seconds, hours, minutes, years, etc)

5. Q: What do you mean when you talk about the frequency and period of a wave?
Relationship between the two
As you increase the frequency, the period will decrease
Inversely related

6. Q: What do you mean when you talk about the frequency and period of a wave?
Equation:
Period = 1/frequancy
Units:
Frequency is hertz (Hz)
Period/time in seconds

7. PRACTICE PROBLEMS
Frieda the fly flaps its wings back and forth 121 times each second. The period of the wing flapping is ____.

8. PRACTICE PROBLEMS
2. The period of the sound wave produced by a 440 Hertz tuning fork is _________.

9. PRACTICE PROBLEMS
3. A tennis coach paces back and forth along the sideline 10 times in 2 minutes. The frequency of her pacing is ______.

10. PRACTICE PROBLEMS
4. Olive Udadi accompanies her father to the park for an afternoon of fun. While there, she hops on the swing and begins a motion characterized by a complete back-and-forth cycle every 2 sec. The frequency of swing is _____. The period of swing is ______.

11. Q: What is the relationship between speed, frequency, and wavelength?
Speed is not dependent on wavelength or frequency
Speed IS dependent on the medium of travel
Sound waves travel fastest through solids and slowest through gases
Think of the closeness of particles/ease of energy transfer!

12. Q: What is the relationship between speed, frequency, and wavelength?
As the wavelength increases:
Waves spread out, so frequency decreases
Wavelength and frequency are INVERSELY related

13. Q: What is the relationship between speed, frequency, and wavelength?
WAVE Equation:
Speed = wavelength x frequency
Units:
frequency in hertz (Hz)
wavelength can be any type of distance units
velocity is in distance units over seconds

14. PRACTICE PROBLEMS
1. Mac and Tosh stand 8 meters apart and demonstrate the motion of a transverse wave on a snakey. The wave can be described as having a vertical distance of 32 cm from a trough to a crest, a frequency of 2.4 Hz, and a horizontal distance of 48 cm from a crest to the nearest trough. Determine the amplitude, period, and wavelength and speed of such a wave.

15. PRACTICE PROBLEMS
2. Ocean waves are observed to travel along the water surface during a developing storm. A Coast Guard weather station observes that there is a vertical distance from high point to low point of 4.6 meters and a horizontal distance of 8.6 meters between adjacent crests. The waves splash into the station once every 6.2 seconds. Determine the frequency and the speed of these waves.

16. Homework
Part 3 of pkt
Continue working on exam review!