1. Chapter 8
Waves

2. What are Waves? Rhythmic disturbance that carries energy
If the wave needs a medium it’s a mechanical wave
If they can travel through space without a medium its an electromagnetic wave

3. Mechanical Waves Transverse Compressional
Matter moves up and down or back and forth at right angles to the wave motion
Compressional
Matter moves forward and backward along the same direction as the wave–
example sound waves

4. Electromagnetic Waves
Waves that travel where there is no matter
Radio Waves
Infrared Waves
Visible Light Waves
X-Rays
Sun’s Rays

5. Wave Properties Amplitude—distance above or below the normal line
Related to amount of energy the wave carries
Greater the energy the bigger the amplitude
Wavelength– the distance from the top of one crest to
the next
Frequency—how many wavelengths pass a point in 1 sec.
Frequency and Wavelength together effect color and
pitch
blue light> frequency, < wavelength than red
higher frequency= higher pitch

6. Wave Properties Wave speed—frequency times wavelength
Draw and label the wave below

7. Wave Behavior Reflection—when waves strike a surface and bounce back
Refraction--bending of waves as they move from one medium to another
Diffraction—bending of waves around a barrier

8. What happens when waves meet?
Interference—when two waves combine to form a new wave
Reducing noise--ear protection devices
contain materials to absorb
some of the energy carried
by sound waves