Properties of Light Waves Characteristics of Light.

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Presentation transcript:

Properties of Light Waves Characteristics of Light

10 facts about light

Light interacts with matter by:  Transmission  Absorption  Scattering

 Components of the E.S.  Radio Waves  Microwaves  Infrared Waves  Visible Light  Ultraviolet waves  X-rays  Gamma rays

 Particles  Waves  Combination of Both

 Definition: Light is a wave composed of oscillating electric and magnetic fields

Fields are perpendicular to the direction in which the wave moves Transverse Waves

Electromagnetic waves consist of electric and magnetic fields. The fields are mutually perpendicular. Electromagnetic (EM) Waves

Electric and magnetic fields are at right angles to each other

Click below to watch the Visual Concept. Visual Concept

All electromagnetic waves move at the speed of light 2.99 X 10 8 m/s use 3.00 X 10 8 m/s for problems

Relationships between frequency, wavelength, and speed are the same as sound c = f λ

What is the λ range for the FM radio band? 3.4 – 2.78 m

What is the frequency of an electromagnetic wave if it has a wavelength of 1.0 km? 3.0 x 10 5 Hz

Shortwave radio is broadcast between 3.5 and 29.7 Hz. To what range of wavelengths does this correspond? Why is it called shortwave? 85.7 to 10.1 m

What is the frequency of highly energetic ultraviolet radiation that has a wavelength of 125nm? 2.4 x Hz

Brightness is proportional to the source of the light Brightness = 1/distance 2

Illumination is measured in lumens (lm). Illumination depends on the brightness of the source and the distance from the source. Predict the relationship between illumination and distance. It is an inverse square relationship.