# HP Cycle 39

## 5/7 - 5/10

T 5/7

W 5/8

Th 5/9

F 5/10

### 🟢 5: T 5/7 - wave speed, frequency, wavelength

APs: Stat

Today, we'll learn about the relationship between period and frequency ( f = 1 / T ) and the relationship between wave speed, frequency, and wavelength ( v = f λ ).  Remember that the speed of the wave depends on the properties of the medium (temperature and composition of a gas or liquid, tension in a string, material vs vacuum for EM waves).  Frequency will change wavelength and vice versa while the speed of the wave through the medium stays constant.

Vocabulary: wave speed, frequency, period, wavelength

PresentationWaves & Sound (slides 8-15)

HandoutsWave speed, wavelength, period, & frequency Worksheet.pdf (#2-3: radio waves are "light" waves)

Homework:  Finish any of the worksheets you did not finish in class.  If you were not in class or need a refresher, watch the video below:

### 🟩 5: W 5/8 - sound waves, Doppler Effect

AP: Comp Gov, CS-A

Today, we'll learn about how sound waves are created and then heard by our human ears.  Remember that sound waves are longitudinal waves that require a medium to travel through; sound cannot travel through a vacuum.  We'll then learn about

Vocabulary: transverse vs. longitudinal, hearing, Doppler Effect

PresentationWaves & Sound (slides 16-28)

Optional Extra PracticeDoppler Effect Problems (plus answers)

Homework: Finish any of the worksheets you did not finish in class.  If you were not in class or need a refresher, watch the videos below:

### 💚 5: F 5/10 - reflection, interference, standing waves

APs: Euro, APUSH, Macro, Spanish Lit

Today, we'll play with slinkies again to see how waves reflect and interfere.  We'll learn about constructive interference and destructive interference.  We'll also learn about the conditions that might be present to create standing waves, and we'll learn about identifying nodes and antinodes.  Finally, we'll learn about how superposition can result in beats.  We'll solidify our understanding about interference by completing Wave Superposition Worksheet (PH).

Vocabulary: superposition, constructive interference, destructive interference, standing wave, node, antinode

PresentationWaves & Sound (slides 29-36)

HomeworkNo Homework Weekend.  If you were not in class or need a refresher, watch the videos below:

If you need help with the worksheet, this video will help: