1. Chapter 10 Section 2: Glencoe Pages 294-299
Wave Properties
Chapter 10 Section 2: Glencoe
Pages

2. I. Wave properties
A. Transverse waves look like a sine curve (looks like an “S” on its side)
- example drawing – all parts labeled

3. I. Wave properties - sine waves with the shape of a sine curve
Transverse wave picture
- sine waves with the shape of a sine curve

4. B. Parts of a transverse wave
1. Crest – highest point on a transverse wave
2. Trough – lowest point on a transverse wave
3. Amplitude – greatest distance a particle is displaced from its normal resting position

5. B. Parts of a transverse wave
4. Wavelength – distance between 2 successive identical points on a wave
 symbol =  (lambda) measured in meters

6. Wave Properties
5. Period (T) – time required for one full wavelength to pass a certain point (measured in seconds)
6. Frequency (f)– number of wavelengths that pass a point in 1 second
 measured in hertz (Hz)
 named after Heinrich Hertz (1888)
 1 Hz = 1 wavelength (vibration) per second
 can hear 20 Hz (low)  20,000 Hz (high)

7. C. Longitudinal waves 1. No crests or troughs
2. Compressions and rarefactions (stretched)
- example drawing of longitudinal wave (click on
picture)

8. C. Longitudinal waves
Compressions – areas where the medium is squeezed together closer than at equilibrium
Rarefactions – areas where the medium is stretched or expanded farther apart than at equilibrium
One wavelength is from compression to compression or rarefaction to rarefaction

9. Electromagnetic waves
D. Electromagnetic waves (drawn as transverse)
Electromagnetic spectrum and uses
Radio waves – radio broadcasts, radar
Microwaves – cell phones, microwave ovens
Infrared waves – remote controls, CD-ROMS
Visible light – vision
Ultraviolet waves – tanning beds, kills bacteria
X-rays – images of internal organs and bones
Gamma rays – radiation therapy

10. II. Wave speed
A. Wave speed – speed at which a wave travels through a medium
Speed = wavelength / period =  / T or
v =  f