Properties of Light Waves Characteristics of Light.
-
Upload
ashlie-mitchell -
Category
Documents
-
view
254 -
download
7
Transcript of Properties of Light Waves Characteristics of Light.
Properties of Light Waves
Characteristics of Light
10 facts about light
Light interacts with matter by:TransmissionAbsorption 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 108 m/s• use 3.00 X 108 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 105 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 1015 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.