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1. Complete Warm-Up for March 29th.
2. Get your journal ready. Add two pages of guided notes to the next available page.
3. Time Limit: 8 minutes
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Warm-Up March 28th
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Warm-Up March 28th
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S8P5: Students will explore the wave nature of sound and electromagnetic radiation.
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a. Identify the characteristics of electromagnetic and mechanical waves.
b. Describe how the behavior of light waves is manipulated causing reflection, refraction diffraction, and absorption.
c. Explain how the human eye sees objects and colors in terms of wavelengths.
d. Describe how the behavior of waves is affected by medium (such as air, water, solids). D
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What happens when a wave runs into a different medium?
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1.Reflection
2.Refraction
3.Diffraction
4.Interference
5.Polarization
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occurs when a wave strikes an object and bounces off
occurs with all types of waves obeys the Law of Reflection – the
angle of incidence is equal to the angle of reflection D
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When a wave enters a new medium at an angle, one side of the wave changes speed before the other side, causing the wave to bend.
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• amount of bending depends on the speed of light in both materials
a) the greater the difference between the speeds of light in the two media, the more the light is bent
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b) if light slows down as it passes into the new medium, the light is bent towards the normal (an imaginary line drawn perpendicularly through the surface of the material) D
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c) if light speeds up as it passes into the new medium, the light is bent away from the normal
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amount of refraction depends on the wavelength of the light:
red light is bent the least violet light is bent the most white light can be separated into colors by refraction in a prism
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bending of light around a barrier occurs with all types of waves
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• caused when light waves overlap each other
a) constructive – interact to build up waveb) destructive – interact to reduce
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•occurs in all types of waves
• white light can be separated into colors by diffraction and interference using a diffraction grating D
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Ordinary light has waves that vibrate in all directions
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A polarizing filter acts as though it has tiny slits in one direction.
Only some of the light (vibrating in the same way as the slit) can pass through a polarized filter
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Best example of a polarized filter is a pair of sunglasses!
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Review Activity
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In refraction, light bends because _?_
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What occurs when a wave strikes an object and bounces off?
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Which color bends the least when it passes into glass?
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If light passes from air into a medium that will slow it down, light will bend…
Towards the normal or away from the normal?
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In diffraction light bends because __?__
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Which of the following can be used to separate white light into its spectrum colors?
(reflection, refraction, or diffraction)
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When waves overlap each other, ___ occurs.
(reflection, refraction or interference)
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