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 Waves Radio Waves Microwaves Infrared Waves Ultra-Violet Waves X-Ray Waves 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 Bill Nye the Science Guy S01E16 Light and Color https://www.youtube.com/watch?v=XMVY33cZ9To 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 Jerome Simpson on Bengals does Front Flip for Touchdown!!! [HD 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… Intensity Duration 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