1. March 16, 2015
Answer Brain Pop Quiz questions as an anticipation guide (correct while viewing)
On the back, make a double bubble map comparing and contrasting transverse and longitudinal waves
Homework: Read and take notes on chapter 20, section 3. Skills tutor due Friday.

2. March 17, 2015 Complete Parts of a Wave WS front & back
Take out Anatomy of a Wave WS
Take out 20.3 notes
Number a piece of paper 1 – 8 (skip spaces)
Homework: Read and take notes on chapter 21, sections 1 & 2.

3. Investigations Rotate among the 8 activities
Read the directions and complete the activity
Record your observations
Answer questions in italics

4. March 18, 2015
Write a scientific argument based on yesterday’s activities
Take out your notes
Homework: Read and take notes: chapter 21, section 3 & 4. SkillsTutor due Friday

5. March 20, 2015
Read “Glassical Music” on page 6 of Current Science – pay attention to the vocabulary
Take out notes on chapter 21, sections 3 & 4
No homework!

6. Glassical Music Answers
1. friction
2. brain
3. high
4. distilled
5. wavelength
6. compression
7. brain
8. vibrate
9. rarefaction
10. pitch

7. Waves, Sounds, and Light

8. Standards SPS9. Students will investigate the properties of waves.
a. Recognize that all waves transfer energy.
b. Relate frequency and wavelength to the energy of different types of electromagnetic waves and mechanical waves.
c. Compare and contrast the characteristics of electromagnetic and mechanical (sound) waves.
d. Investigate the phenomena of reflection, refraction, interference, and diffraction.
e. Relate the speed of sound to different mediums.
f. Explain the Doppler Effect in terms of everyday interactions.

9. A wave is a disturbance that transmits energy.
The particles of a medium do not travel with the wave.

10. Mechanical waves require a medium, but electromagnetic waves do not

11. Particles in a longitudinal wave vibrate parallel to the direction that the wave travels.
Particles in a transverse wave vibrate perpendicularly to the direction the wave travels. Link

12. Wave Properties
Amplitude is the maximum distance the particles of a medium vibrate from their rest position.
Wavelength is the distance between two adjacent corresponding parts of a wave.
Frequency is the number of waves that pass a given point in a given amount of time.
Wave speed can be calculated by multiplying the wave’s wavelength by the frequency.

13. The shorter the wave, the higher the energy!
Wavelength
The shorter the wave, the higher the energy!

14. The higher the frequency, the higher the energy!

16. Wave Modeling Spring How do transverse & compression waves compare?
How do they contrast?
What effect does increasing the energy into the wave have?
What relationship do you see between wave frequency and wavelength?
Waves on a String PhET

17. Anatomy of a Wave Part 1 – Label the wave according to directions
Part 2 – create waves on the back as follows:

18. Wave Interactions Waves reflect after hitting a barrier.
Refraction is the bending of a wave when it passes through different media.
Waves bend around barriers or through openings during diffraction.
The result of two or more waves overlapping is called interference.
Amplitude increases during constructive interference and decreases during destructive interference.
Resonance occurs when a vibrating object causes another object to vibrate at one of its resonant frequencies.

19. Reflection: Waves reflect after hitting a barrier.

20. Refraction: The bending of a wave when it passes through different media.

21. Diffraction: Waves bend around barriers or through openings

22. The result of two or more waves overlapping is called interference.
Amplitude increases during constructive interference and decreases during destructive interference.

23. Constructive & Destructive Interference
PhET simulation
Demonstration

24. Resonance
Resonance occurs when a vibrating object causes another object to vibrate at one of its resonant frequencies.
Tacoma Narrows Bridge
Wine Glass

25. Practice Which of the following results in more energy in a wave?
A. a smaller wavelength
B. a lower frequency
C. a shallower amplitude
D. a lower speed

26. Answer Which of the following results in more energy in a wave?
A. a smaller wavelength
B. a lower frequency
C. a shallower amplitude
D. a lower speed

27. Practice
Refraction occurs when a wave enters a new medium at an angle because
A. the frequency changes.
B. the amplitude changes.
C. the wave speed changes.
D. the new medium changes.

28. Answer
Refraction occurs when a wave enters a new medium at an angle because
A. the frequency changes.
B. the amplitude changes.
C. the wave speed changes.
D. the new medium changes.

29. Practice
The bending of a wave as it passes at an angle from one medium to another is called
A. reflection.
B. refraction.
C. diffraction.
D. interference.

30. Answer
The bending of a wave as it passes at an angle from one medium to another is called
A. reflection.
B. refraction.
C. diffraction.
D. interference.

31. Sound All sounds are generated by vibrations.
Sounds travel as longitudinal waves consisting of compressions and rarefactions.
Sound waves travel in all directions away from their source.
Sound waves require a medium through which to travel. Sound cannot travel in a vacuum.
Your ears convert sound into electrical impulses that are sent to your brain.
Exposure to loud sounds can cause hearing damage.
Using earplugs and lowering the volume of sounds can prevent hearing damage.

33. Properties of Sound
The speed of sound depends on the medium and the temperature.
The pitch of a sound becomes higher as the frequency of the sound wave becomes higher. Frequency is expressed in units of Hertz (Hz), which is equivalent to waves per second.
The Doppler effect is the apparent change in frequency of a sound caused by the motion of either the listener or the source of the sound.
Loudness increases with the amplitude of the sound. Loudness is expressed in decibels.
The amplitude and frequency of a sound can be measured electronically by an oscilloscope.

34. Sound requires a medium
Alarm clock in a bell jar demo

35. How We Hear: We lose the ability to hear higher pitches as we age.
Damage to any part of the ear can cause deafness.

36. The speed of sound depends on the medium and the temperature.

37. The pitch of a sound becomes higher as the frequency of the sound wave becomes higher.

38. The Doppler effect is the apparent change in frequency of a sound caused by the motion of either the listener or the source of the sound.

39. Loudness increases with the amplitude of the sound
Loudness increases with the amplitude of the sound. Loudness is expressed in decibels.