Longitudinal Waves

Have to go through a medium (air, water, rock)

The disturbance travels not the particles.

Transverse Waves

Does not have to pass through a medium

Particles move up and down

Parts of a Transverse Wave

Crest- the highest point Trough- the lowest point

Rest position- the position of the wave before any disturbance

Amplitude

the greatest distance that wave particles move from their rest position

Fig. 7.2

Wavelength () the distance between one point

in the wave to the nearest point just like it

Transverse:› Crest to crest› Trough to trough

Longitudinal:- Compression to Compression- Rarefaction to Rarefaction

wavelength

wavelength

Frequency ( f )

# of waves passing a point in 1 second

F = Unit is Hertz (Hz)

– shorter wavelength higher frequency

1 second

↑Frequency =↓wavelength

Humans can hear 20Hz to 20KHz Lose hearing of high pitches as you

get older Bass lower frequency and less energy

1. Indicate the interval which represents one full wavelength.

A. a to c B. b to d C. a to g D. c to g

Electromagnetic Spectrum

Radiation Traveling in Space

Radio Wavelengths

Microwaves

Infrared Radiation

Visible Light

Ultraviolet

X-Rays

Gamma Rays

Type of Radiation

Wavelength Dangerous Detected By Blocked By

Radio Longest No Radio Receiver

Viaducts, Power lines

Microwaves Longer No Heated Food Water

Infrared (heat)

Long No Thermometer Clouds

Light (ROY G BIV)

Medium No Eyes Eyes

Ultra Violet Short Yes Skin Ozone Layer

X-Rays Shorter Yes Film Earth’s Magnetic Field

Gamma Shortest Yes Geiger Counter

Earth’s Magnetic Field

Three Series of Spectral Lines of Atomic Hydrogen

Fig. 7.9

Emission and Absorption Spectraof Sodium Atoms

Fig. 7.B