Download Chapter 15 Notes- Sound and Light

Chapter 15 Notes- Sound and Light
Section 2- The Nature of Light
Waves and Particles
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The two most commonly used models describe __________ either as a ________ or as a stream of ___________.
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Light produces interference patterns like _________ waves.
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Light can be modeled as a ________.
o
This model describes light as _______________ waves that do not require a _______________ in which
to travel.
o
Light waves are also called _________________________ waves because they consist of changing
electric and magnetic fields.
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The wave model of light explains much of the observed behavior of light.
o
Light waves may _______________, ________________, or ___________________.
o
Light waves also ___________________ with one another.
The ______________ model of light cannot explain some observations.
o
When light strikes a piece of metal, _________________ may fly off the metal’s surface.
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Light can be modeled as a stream of _______________.
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In the particle model of light, the energy of light is contained in packets called _______________.
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A photon is a ____________ or quantum of light.
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A beam of light is considered to be a ________________________________.
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Photons do not have ___________________.
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The ______________ in a photon is located in a particular place.
The Electromagnetic Spectrum
Type of wave
Uses
__________ Frequency, __________ wavelength Used in
medicine for _________ radiation therapy ____________ energy,
can kill cells and people
Used in _____________ to take pictures of __________. Has
enough energy to pass through __________ and soft tissue, but is
stopped by ____________.
Part of sunlight that _______ skin. Can cause damage to _______
and cause ________ cancer. Can only pass through first few
layers of skin. Used in _____________ to sterilize equipment.
Part of light that we can ________. ROYGBIV
Red- __________ frequency, ___________ wavelength
Violet- __________ frequency, ____________ wavelength
Can be felt as _________. Used in heat lamps to warm _______.
Also can be used in medicine to detect ______________ and by
police/ military to find people in the __________.
Used in ____________ and ____________________.
Microwaves cook food by heating _____________ in food.
____________________ can use microwaves to send signals
____________ Frequency, _____________wavelength Used in
________________ and __________. Radio stations broadcast
_______________ using these waves. Can also use radio waves
to detect _____________ of objects.
Section 3- Reflection and Color
Reflection of Light
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Light can be modeled as a __________.
o
A light ray is a ________________ in space that matches the direction and flow of radiant energy.
o
This model is used to describe ________________ and ______________________.
_____________ surfaces reflect light rays in
__________ directions.
o
Such reflection of light into random
directions is called ___________ reflection.
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__________ surfaces reflect light rays in ______
direction.
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On smooth surfaces, the angle of the light rays reflecting off the surface is called the angle of _____________.
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The angle of _____________________ is the angle of the light rays striking the surface.
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The law of ____________ states that the angle of _______________ equals the angle of ________________.
Seeing Colors
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The different _________________ of visible light correspond to
many of the colors that you perceive.
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Objects have color because they ___________ certain wavelengths.
o
__________ light from the sun actually contains light
from the visible wavelengths of the electromagnetic
spectrum.
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Colors may add or subtract to produce other colors.
Section 4- Refraction of Light
Refraction of Light
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Light waves bend, or ___________, when they pass from one _______________ to another.
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Light __________ when it changes mediums because the speed of light is ______________ in each medium.
o
When light moves from a material in which its speed is ___________ to a material in which its speed is
______________, the ray is bent _____________ the normal.
o
If light moves from a material in which its speed is ___________ to one in which its speed is
___________, the ray is bent ____________ from the normal.
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Refraction makes objects appear to be in
______________ positions.
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Refraction in the atmosphere creates ____________.
o
A mirage is a ______________ image.