# WJHS - Electromagnetic Spectrum

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### Transverse Wave

Particles move up and down as the wave moves forward

### THz

1,000,000,000,000 Hz = The range of frequencies of visible light

### 1 Meter

1,000,000,000 nanometers (nm) = the range of wavelengths of visible light

### Frequency

Refers to the number of complete cycles, crest to crest,or trough to trough that occur per second. Units are the Hertz = Hz

### Crest

Waves are labeled with positive and negative motion. The _________ is the extreme on the positive (+) side.

### The Electromagnetic Spectrum

A group of energy forms including radio waves, microwaves, and gamma rays.

### Sir Isaac Newton

Conducted the first experiments using prisms to prove that white light is made of colors.

### Amplitude

This is the distance from "rest" to "crest"

### Trough

Waves are labeled with positive and negative motion. The _______ is the extreme on the negative (-) side.

### Reflection

When a light wave meets a boundary it can be bounced off a surface.

### Wave

Caused by a disturbance that transfers energy from one point to another.

### Longitudinal Wave

Particles move back and forth (oscillate) like a slinky.

### Refraction

Occurs when a wave crosses a boundary from one medium to another causing the speed of light to change.

### Wavelength

The distance from crest to crest or trough to trough.

### Lasers

A device that works by agitating, then organizing, then energizing particles enough that they stay as a very tight beam of one frequency = one color

### Diffraction Grating

The plastic material in the eyepiece of a spectroscope covered with very close, straight lines.

### Kinetic Energy

Radiant energy is an example of this type of energy

### Spectroscope

A device that uses diffraction to view the spectrum colors of light.

### ROY G BIV

Colors of the visible spectrum

A form of kinetic energy that can travel through the vacuum of space.

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