Download - Effects of Electromagnetic Waves
Effects of Electromagnetic Waves
Light:Temperature, Scattering &
Absorption
Essential Standards
• 6.P.3 Understand characteristics of energy transfer and interactions of matter and energy.
Clarifying Objectives
• 6.P .3.2 Explain the effects of electromagnetic waves on various materials to include absorption, scattering, and change in temperature.
Essential Questions
• How does light influence TEMPERATURE of an object?
• How does the sun’s energy arrive as light?
• How does light ABSORB matter?
• How does light SCATTER matter?
Light Waves• Electromagnet waves
transmit/transfer energy in light waves
• Light is Photon ENERGY that travels through WAVES
• These waves are Electromagnetic Waves
• These Electromagnetic Waves create the Electromagnetic Spectrum
Photons• Photons are particles that have a
0 mass
• Electromagnetic waves are carried through the electromagnetic spectrum by photons
• These photons can move through mediums but do not need to
• They can pass through vacuums
Types of Electromagnetic Waves• There are 6 different types of
Electromagnetic Waves① Radio Waves② Microwaves③ Infrared Waves④ Ultra-Violet Waves⑤ X-Ray Waves⑥ Gamma Waves
• All different types of Electromagnetic waves have the differences
Electromagnetic Spectrum
Effects of Wavelengths
• Shorter Wavelength = more Energy
• Shorter Wavelength = more Photons
• Shorter Wavelength = more Intensity
The Sun
• The sun’s wavelength energy comes to the Earth in 3 ways
• These 3 waves come in different wavelengths
White Light is different• http://www.youtube.com/wa
tch?v=gtgBHsSzCPE
• White light is different because it is a MIXTURE of ALL the COLORS OF THE RAINBOW
• White light shines down on every object just different objects reflect different lights and absorb the rest
• http://www.youtube.com/watch?v=JqLmJ-lDHEQ
• Look at the jerseys of the players & other colors this all started as white light
White Light is different
• All white light goes through a natural prism as it enters the earth’s atmosphere and different objects absorb & reflect different colors
• http://www.youtube.com/watch?v=YWYrjqfZqA8
• Basketball absorbs all light except it reflects orange light (which is what we see)
Essential Questions
• Get with a partner and answer…
• How does the sun’s energy arrive as light?
Electromagnetic Waves (Light) Affect ABSORPTION
• Absorption is the opposite of reflection
• If light is not absorbed it is reflected
• Absorption is how many of the photons of light are going into a material
• The darker a material is the more absorption will take place
Electromagnetic Waves (Light) Affect SCATTERING
• Scattering of Electromagnetic waves is when light hits particles and scatters everywhere
• Light as it is coming down is white as we know when it hits something it scatters
Essential Questions
• Get with a partner and answer…
• How does light ABSORB matter?
• How does light SCATTER matter?
Electromagnetic Waves (Light) Affect TEMPERATURE
• Electromagnetic Waves affect Temperature in three ways
• Temperature will change depending on…① Intensity② Duration③ Absorption (Amount of
Light)
Electromagnetic Waves (Light) Affect TEMPERATURE [Intensity]
• Intensity of light is the #number of PHOTONS being emitted by a light source
• The more INTENSE (photons) the light is the hotter the temperature will be
Electromagnetic Waves (Light) Affect TEMPERATURE [Absorption]
• Absorption is the opposite of reflection
• Absorption is how many of the photons of light are going into a material
• The darker a material is the more absorption will take place
• http://www.youtube.com/watch?v=gtgBHsSzCPE
• 3:40-4:04
Electromagnetic Waves (Light) Affect TEMPERATURE [Duration]
• Duration is the AMOUNT OF TIME that the light wave (photons) is shining on the object
• For example in the summer time the DURATION or time of light is more
• In the winter time the DURATION of light is shorter
• The longer the DURATION the higher the temperature will be
Essential Questions
• Get with a partner and answer…
• How does light influence TEMPERATURE of an object?
EOG Questions• During the day, the sand at the beach is very warm; while at night, it is cooler.
Why does this occur?
• A) The sand reflects the sun’s energy during the day, causing it to become warmer.
• B) The sand absorbs the sun’s energy during the day, causing it to become warmer.
• C) The sand scatters the sun’s energy during the day, causing it to become warmer.
• D) The sand refracts the sun’s energy during the day, causing it to become warmer.
Important Points• Electromagnetic Waves are
either Reflected or Absorbed
• Absorption is how many photons from waves are transfer into a material
• Temperature depends on – Duration of light– Absorption of light waves– Intensity of light waves
• Scattering is when light waves no longer travel in a straight line & start reflecting every which way
• The sun transmits energy through– Infrared– Visible – Ultra violet
• White light carries all the colors of the rainbow and is always scattered