The Electromagnetic Spectrum - Implications

The Electromagnetic Spectrum













































Wavelengths in this range are seen as colors.

Notice that the longest visible wavelength is only about twice the shortest --- a very narrow range.

Implications --- Example: --- Question:

































Near infrared --- 700 nm to 20,000 nm
Far infrared --- 20,000 nm to 100,000 nm
Microwave --- 0.01 cm to 20 cm.
Short-wave radio --- 20 cm to 2.5 m.
FM radio ---- 2.5 m to 3.5 m
UHF TV, VHF TV, AM Radio
ELF

Implications --- Example: --- Question:

































Ultraviolet light (A) --- 90 nm to 400 nm. Ultraviolet light (B) --- 20 nm to 90 nm. X-rays(soft) ------------ 1 nm to 20 nm. X-rays (hard) --------- 0.1 nm to 1 nm. Gamma rays

Implications --- Example: --- Question:

































Light is usually a mixture of many wavelengths.

The set of wavelengths present in a given light source is called its spectrum.

Implications --- Example: --- Question: