# Waves

### 21 terms by peoneill Teacher

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### 2 relationships for waves

1) speed and frequency = directly proportional
(as speed goes up, frequency goes up)
2) wavelength and frequency = inversely proportional
(as wavelength gets longer, frequency goes down)

### amplitude

for transverse waves: the distance between the resting point (or equilibrium) to the crest or trough

### constructive interference

when waves combine to a larger amplitude

### crest

highest point (peak) of a wave

### destructive interference

when waves cancel each other out

### diffraction

the spreading out of waves through an opening or around the edges of an obstacle

### diffraction examples

light will bend around a lampshade; sounds can be heard even if you are hiding behind something

### EM Wave

electromagnetic wave; moves energy through space (sometimes empty space, sometimes through a medium)

### Examples of EM Waves

Radio, infrared (IR), light

### Examples of mechanical waves

Sound, ocean waves, earthquakes

### frequency

the number of waves passing a fixed point in a certain amount of time; it is based partly on wavelength (longer wavelengths take a longer time to pass) and partly on the speed the wave travels

### interference

the meeting and combining of waves

### mechanical wave

waves that transfer energy through matter

### medium

any substance that a wave moves through

### reflection

the bouncing back of a wave as it strikes a barrier

### reflection examples

mirror (light waves), echo (sound waves), RADAR (radio waves)

### refraction

the bending of a wave as it enters a new medium at an angle other than 90 degrees

### refraction examples

a straw looks "broken" when you look at it in a glass of water (because the light bends when it enters the water)

### trough

lowest point (valley) of a wave

### wave

a disturbance that transfers energy from one place to another

### wavelength

the distance from one wave crest to the very next crest. (This may also be measured from trough to trough.)

Example:

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