The Electromagnetic Spectrum - Ch 3

25 terms by mdenham

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electromagnetic wave

Transverse waves that transfer electrical and magnetic energy.

electromagnetic radiation

The energy transferred through space by electromagnetic waves.

polarized light

Light that vibrates in only one direction.

photoelectric effect

The ejection of electrons from a substance when light is shined on it.

photon

A tiny particle or packet of light energy.

electromagnetic spectrum

The complete range of electromagnetic waves placed in order of increasing frequency.

radio waves

Electromagnetic waves with the longest wavelengths and lowest frequencies.

microwaves

Radio waves with the shortest wavelengths and highest frequencies.

radar

A system that uses reflected radio waves to detect objects and measure their distance and speed.

infrared rays

Electromagnetic waves with wavelengths shorter than radio waves but longer than visible light.

thermogram

An image that shows regions of different temperatures in different colors.

visible light

Electromagnetic waves that are visible to the human eye.

ultraviolet rays

Electromagnetic waves with wavelengths shorter than visible light, but longer than X-rays.

x-rays

Electromagnetic waves with wavelengths shorter than ultraviolet rays, but longer than gamma rays.

gamma rays

Electromagnetic waves with the shortest wavelengths and highest frequencies.

illuminated

Word used to describe an object that can be seen because it reflects light.

luminous

Word used to describe an object that can be seen because it emits light.

spectroscope

An instrument used to view the different colors of light produced by different light sources.

incandescent light

Light bulb that glows when a filament inside it gets white hot.

tungsten-halogen bulb

Incandescent light bulb containing a tungsten filament and a halogen gas.

fluorescent light

Light bulb that glows when an electric current causes ultraviolet rays to strike a coating inside a tube.

vapor light

Light bulb containing neon or argon gas along with a small amount of solid sodium or mercury.

neon light

Glas tube containing neon gas that produces light.

amplitude modulation

A method of transmitting signals by changing the amplitude of a wave.

frequency modulation

A method of transmitting signals by changing the frequency of a wave.

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