WAVES

WHAT ARE WAVES

• A wave is a disturbance that transfers energy from place to place

TWO TYPES OF WAVES

Longitudinal wave-a wave that moves a medium in direction the wave move

Transverse wave
Transverse means across or right angle to the direction of the wave.

PROPERTIES OF WAVES SECTION 2

• Amplitude
• Wave length
• Frequency
• Speed

Amplitude
Is the maximum distance that the particles of huge medium carrying the wave move away from their rest position.

Wave length
You can find the wave length of a transverse wave by measuring the distance from Crest to crest.

Frequency
Is the number of complete
Waves that pass a given point of a certain amount of time.

Longitude waves
Move the medium parallel to the direction in witch the waves travel.

Ch.1 section 3
Interactions of waves
.reflection
.refraction
.diffraction
.interference
.standing waves

Reflection
When you look in your mirror, you used light that was reflected to see yourself.

Refraction
The bending of waves due to a change in speed is called refraction.

Diffraction
Waves diffract when they move around a barrier or pass through an opening.

Interference
Is the interference between two waves that meet.

Standing waves
Is a wave that appears to stand in one place even though it's two waves interfering as they pass through each other.

S WAVES

P WAVE

Detecting seismic waves

Detect seismic waves you use what's called a Seismograph which records the ground movements caused by waves as they move through the earth. P waves move to the seismograph before S waves so by measuring the time between the arrival of the wave, we are able to tell how far away the earthquake was.

Interaction of sound waves
Sound waves reflect off objects diffract through narrow openings and around barriers and interfere with each other.

Instrument and voice

Pitch

Have you ever described someone's voice as "highpitched"or"low pitched" the pitch of a sound is a description of high or low the sound seems to a person.

Loudness

Describes your perception of energy of a sound. I. Other words, loudness describes what u hear.

Voice

When a person speaks or sings, the vocal cords vibrate. The vibrations produce sound waves in the air.

Electromagnetic waves

An electromagnetic wave consists of vibrating electric and magnetic fields that move through space at the speed of light.

TYPES OF ELECTROMAGNETIC WAVES

• Electric fields
• Magnetic fields