Electromagnetic Waves

What kind of disturbance creates an EM wave?

A changing magnetic field will cause a changing electric field, thus creating electromagnetic waves

What are two ways that EM waves are different from mechanical waves?

Electromagnetic waves do not need a meduim to propigate. EM waves can travel at very high velocities while sound waves travel much slower

Describe the different ranges of the EM spectrum with respect to wavelength, frequency and energy

Radio waves - Longest wavelength, lowest frequency, 30kHz to 3GHz, low energy (Am radio, Amateur radio)

Microwaves - Longer wavelenght, low frequencey, 300MHz to 300GHz, lower energy waves ( Microwave oven, satelites)


Infared - 1000 micrometers to 0.7 micrometers, Low to meduim energy waves, third longest wave lenght of EM spectrum (TV remote control, night vision goggles)

Describe the different ranges of the EM spectrum with respect to wavelength, frequency and energy

Visible light - Frequences range from 700nm to 400nm, medium energy waves, medium wavelenght (Fireflies, lightbulbs)

Ultraviolet Waves - Frequences range from 400nm to 10nm, medium to high energy waves, third shortest wavelength (Light from the sun,tanning booth)

X-Ray - Frequences range from 100eV to 200KeV, Second highest frequency, high energy (Security scanner, doctors x-ray machine)

Describe the different ranges of the EM spectrum with respect to wavelength, frequency and energy

Gamma Waves - Frequences range from 200KeV to 200MeV Shortest wavelenght, highest frequency (PET scan, gamma ray specrometer)
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