Electromagnetic Spectrum and Light Review

I can identify different regions on the electromagnetic scale including radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays The electromagnetic spectrum represents the range of energy from low energy, low frequency radio waves with long wavelengths up to high energy, high frequency gamma waves with small wavelengths.

I can identify different regions on the electromagnetic scale including radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays. Type of RayReal Life Example  Radio waves – send information  Microwaves – used to heat things in a microwave  Infrared rays – used to detect heat in areas  Visible light – all the colors and light we see  Ultraviolet rays – emitted by the sun  X-rays – used to see bones inside the body  Gamma rays – used to treat cancer

I can identify different regions on the electromagnetic scale including radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays. Visible light is a small portion of this spectrum. This is the only part of this energy range that our eyes can detect. What we see is a rainbow of colors. R ed O range Y ellow G reen B lue I ndigo V iolet Longest wavelengthshortest wavelength ROY G BIV

I can explain why radio waves can travel through space, but sound waves cannot.  Electromagnetic waves do not require a medium to travel  They are able to travel through solids, gases, liquids as well as space  Light travels in energy packets called photons  Photons move at the speed of light (186,000 miles per second)  Benefits  Information can be sent from space  Satellites can be used for phones/t.v.s

I can give the reason that we see a distant event before we hear it.  Light travels faster than sound  Light does not require a medium and moves at a constant speed  Sound requires a medium and speed depends on frequency and wavelength  Examples of events?

I can explain how various materials reflect, absorb, and transmit light in different ways.  When light strikes an object there are three options  Reflected, absorbed, or transmitted  Most objects reflect or absorb  Opaque—a material that reflects or absorbs all of the light that strikes it  Wood, metal, cotton

I can explain how various materials reflect, absorb, and transmit light in different ways.  Transparent - objects that transmit light  Examples:  Glass  Air  Water

I can explain how various materials reflect, absorb, and transmit light in different ways.  Translucent - materials that allow some light to pass through  Examples:  Frosted glass  Wax paper  Some white paper

I can draw ray diagrams to indicate how light reflects off objects or refracts into transparent media.  You can see most objects because light reflects, or bounces, off them.  When light enters a different medium, the light waves are bent or refracted.  This causes things to appear to be bent or broken.

I can predict the path of reflected light from flat, curved, or rough surfaces.  Regular Reflection – rays will reflect at the same angle they hit a smooth surface

I can predict the path of reflected light from flat, curved, or rough surfaces.  Diffuse reflection - when parallel rays of light hit a bumpy, or uneven surface  Most objects reflect this way

Questions  Complete this diagram in your notes I can predict the path of reflected light from flat, curved, or rough surfaces.

 Plane (flat) mirrors produce an image that is right-side up and the same size as the object being reflected  Image is called “virtual image”

I can predict the path of reflected light from flat, curved, or rough surfaces.  Concave mirror - mirror with a surface that curves inward  Type of image depends on position relative to the focal point

I can predict the path of reflected light from flat, curved, or rough surfaces.  Complete the ray diagram for this concave mirror Focal Point

I can predict the path of reflected light from flat, curved, or rough surfaces.  Convex Mirror - mirror with a surface curved outward

I can predict the path of reflected light from flat, curved, or rough surfaces.  Complete the ray diagram for the following convex mirror Focal Point

I can explain why the image of the sun appears reddish at sunrise and sunset.  As the Earth turns, the angle of the suns rays are hitting us differently.  During the day, they are filtered through the atmosphere, scattering the light and making the sky appear blue.  In the evening, just as in the morning, the rays are scattered differently and due to the longer wavelength, we see the reds and oranges.