Section 1 Characteristics of Light

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Presentation transcript:

Section 1 Characteristics of Light Chapter 14 Objectives Identify the components of the electromagnetic spectrum. Calculate the frequency or wavelength of electromagnetic radiation. Recognize that light has a finite speed. Describe how the brightness of a light source is affected by distance.

Electromagnetic Waves Section 1 Characteristics of Light Chapter 14 Electromagnetic Waves An electromagnetic wave is a wave that consists of oscillating electric and magnetic fields, which radiate outward from the source at the speed of light. Light is a form of electromagnetic radiation. The electromagnetic spectrum includes more than visible light.

The Electromagnetic Spectrum Section 1 Characteristics of Light Chapter 14 The Electromagnetic Spectrum

The Electromagnetic Spectrum, continued Section 1 Characteristics of Light Chapter 14 The Electromagnetic Spectrum, continued Insert High-Res image from TR114

Electromagnetic Waves, continued Section 1 Characteristics of Light Chapter 14 Electromagnetic Waves, continued Electromagnetic waves vary depending on frequency and wavelength. All electromagnetic waves move at the speed of light. The speed of light, c, equals c = 3.00  108 m/s Wave Speed Equation c = fl speed of light = frequency  wavelength

Electromagnetic Waves Section 1 Characteristics of Light Chapter 14 Electromagnetic Waves http://www.youtube.com/watch?v=cfXzwh3KadE

Electromagnetic Waves (visible light) Section 1 Characteristics of Light Chapter 14 Electromagnetic Waves (visible light) Objects are either luminous or illuminated. Luminous objects produce (emit) light Illuminated objects reflect light

Electromagnetic Waves, continued Section 1 Characteristics of Light Chapter 14 Electromagnetic Waves, continued Illuminance decreases as the square of the distance from the source. The rate at which light is emitted from a source is called the luminous flux and is measured in lumens (lm).

Wave-Particle Duality Section 1 Characteristics of Light Chapter 14 Wave-Particle Duality Light behaves as both a wave and a particle. This notion is called the wave-particle duality. A photon is a unit or quantum of light. Photons can be thought of as particles of electromagnetic radiation that have zero mass and carry one quantum of energy.