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Electromagnetic waves are classified according to their wavelengths. PowerPoint PPT Presentation


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16-1 Energy in Earth’s Atmosphere(pages 542–545) 1. State in what form energy travels from the sun to the earth. 2. Explain what happens to the sun’s energy in the atmosphere and at Earth’s surface.

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Electromagnetic waves are classified according to their wavelengths.

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Electromagnetic waves are classified according to their wavelengths

16-1EnergyinEarth’s Atmosphere(pages 542–545)1. State in what form energy travels from the sun to the earth.2. Explain what happens to the sun’s energy in the atmosphere and at Earth’s surface.


Electromagnetic waves are classified according to their wavelengths

EnergyFromtheSun (pages542–543)1. State in what form energy travels from the sun to the earth.

KeyConcept:Mostoftheenergyfromthesuntravelsto Earth in the form of visible light and infraredradiation.A small amount arrives as ultravioletradiation.


Electromagnetic waves are classified according to their wavelengths

EnergyfromthesuntravelstoEarthaselectromagneticwaves.Electromagneticwaves are a form of energythat can travel through space.


Electromagnetic waves are classified according to their wavelengths

Electromagnetic waves are classified according to theirwavelengths.


Radiation is the direct transfer of energy by electromagnetic waves

Radiationis the direct transfer of energy byelectromagnetic waves.


Visible light is the light you can see

Visible light is the light you can see.


Electromagnetic waves are classified according to their wavelengths

Infraredradiationhaswavelengthsthatarelongerthanvisible light.You cannot see infrared radiation, but you can feel it as heat.


Electromagnetic waves are classified according to their wavelengths

Ultraviolet radiationhas wavelengths that are shorterthan visible light.Ultravioletradiation causes sunburn.


Electromagnetic waves are classified according to their wavelengths

true


Electromagnetic waves are classified according to their wavelengths

EnergyintheAtmosphere(page544)2. Explain what happens to the sun’s energy in the atmosphere and at Earth’s surface.

Key Concept:Some sunlight is absorbed or reflectedbytheatmospherebeforeitcanreachthesurface.Therest passes through the atmosphere to the surface.


Electromagnetic waves are classified according to their wavelengths

Partofthesun’senergyisabsorbedbytheatmosphere.When energy is absorbed, it is taken in by a substance.Forexample,watervaporandcarbondioxideabsorbthesome of the sun’s energy.


Electromagnetic waves are classified according to their wavelengths

Part of the sun’s energy is reflected back into space.When energy is reflected, it bounces off without being absorbed.Clouds reflect some sunlight back into space.


Electromagnetic waves are classified according to their wavelengths

Dust particles and gases in the air reflect light in alldirections.Reflecting light in all directions is calledscattering.


About half of the sun s energy passes through the atmosphere to earth s surface

About half of the sun’s energy passes through the atmosphere to Earth’ssurface.


Electromagnetic waves are classified according to their wavelengths

scattering


Electromagnetic waves are classified according to their wavelengths

2. Explain what happens to the sun’s energy in the atmosphere and at Earth’s surface.Key Concept: When Earth’s surface is heated, it radiates most of the energy back into the atmosphere as infrared radiation.


The energy that reaches earth s surface heats the land and water

The energy that reaches Earth’s surface heats the land and water.


Electromagnetic waves are classified according to their wavelengths

The surface of Earth is heated by the sun. The heated surface then radiates the heat back into the atmosphere. The radiation from Earth’s surface is infrared radiation.


Electromagnetic waves are classified according to their wavelengths

Some of the infrared radiation from Earth’s surface is taken in by gases in the atmosphere. The gases that take in this heat include carbon dioxide and water vapor. When gases hold heat in the air, it is called the greenhouse effect.


Electromagnetic waves are classified according to their wavelengths

The greenhouse effect is natural. Because of the greenhouse effect, Earth’s average temperatures remain about the same.


Electromagnetic waves are classified according to their wavelengths

Greenhouse effect

radiates

Earth

gases


Electromagnetic waves are classified according to their wavelengths

THE END


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