1. WAVE INTERACTIONS

2. Longitudinal Wave Compressional Wave wave particles vibrate back
and forth along the path that
the wave travels.
Compressional Wave

3. Compressions
The close together part of the wave
Rarefactions
The spread-out parts of a wave

4. Transverse waves
wave particles vibrate
in an up-and-down motion.

5. Transverse waves Crests Highest part of a wave Troughs
The low points of the wave

6. Amplitude- Frequency is the maximum distance the particles in a wave
vibrate from their rest positions. (The farther the sound travels, the louder it is and vis versa.)
Frequency
- the number of waves
produced in a given time (The faster the waves the higher the pitch, the slower the waves the lower the pitch)

7. Waves transfer energy without transferring matter.
Frequency= waves/time

8. II. Properties of Sound

9. - description of how high or low
Pitch
- description of how high or low
the sound seems to a person
. Loudness-
how loud or soft a sound is
perceived to be.

10. Loudness of Sound in Decibels
Loudness (dbs)
Hearing Damage
Average Home
40-50
Loud Music
90-100
After long exposure
Rock Concert
Progressive
Jet Engine
Pain

11. Ultrasound Infrasound Sounds in the range from 20-100kHz
- sound waves with frequencies above the normal human range of hearing.
Sounds in the range from kHz
Infrasound
- sounds with frequencies below the
normal human range of hearing.
Sounds in the Hz range

12. Interference
the result of two or more sound waves overlapping (Constructive vs. Destructive)

13. Resonance exactly matches the natural frequency of an object.
the frequency of sound waves
exactly matches the natural frequency
of an object.
Or - when one object vibrates at the same
natural frequency of a second object, which forces
that second object into a vibration motion.
Harmonics – are caused when a sound frequency accidentally produces another faint sounds.

14. Different sounds that you hear include
(A) noise, (B) pure tones (produced by a machine), and (C) musical notes (IE. Voice/instrument).

15. Doppler Effect is the apparent change in the
frequency of a sound caused by
the motion of either the listener
or the source of the sound.

17. Let’s Apply this knowledge!
HYvs
*Have a piece of paper
Put your name
Your Group number on it.
Once done, get into your groups.
Lets observe some science experiments!