Electromagnetic Spectrum & Wave Properties

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Presentation Description

This lesson describes electromagnetic radiant energy, provides a brief overview of the electromagnetic spectrum and discusses the relationship between wavelength, frequency and wave energy.

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Presentation Transcript

Electromagnetic Spectrum:

Electromagnetic Spectrum Energy can be supplied to electrons in an atom by electromagnetic (or radiant ) energy Electromagnetic (radiant) energy travels: In waves Through empty space At the speed of light

Types of Electromagnetic Radiation:

Types of Electromagnetic Radiation Radio waves Microwaves Radiant heat (infrared) Visible light Ultraviolet (UV), X-rays, Gamma rays All of these combined create the Electromagnetic Spectrum

Properties of a Wave:

Properties of a Wave Wavelength (l) – distance between 2 peaks or 2 troughs Frequency (n) – number of waves in a given time period (usually 1/sec, or Hz)

Electromagnetic Waves: Properties & Relationships:

Electromagnetic Waves: Properties & Relationships Wavelength and frequency are inversely proportional Product of wavelength & frequency produces a constant value Frequency and energy are directly proportional Quotient of energy & frequency produces a constant value Two useful equations derived from these relationships: c (speed of light) 3.0×10 8 m/s h (Planck’s Constant) 6.626×10 -34 J  s

Practice:

Practice If the wavelength of a wave is 2.34 x 10 -11 m, what is the frequency?

Practice:

Practice If the frequency of a wave is 3.54 x 10 8 Hz, what is the energy of the wave?

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