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Title:

Waves

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Waves & Medium Any substance that a wave moves through is a medium Sound waves, Earthquake waves, and ocean waves all require matter to transfer energy – PowerPoint PPT presentation

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Title: Waves


1
Waves Medium
  • Any substance that a wave
  • moves through is a medium
  • Sound waves, Earthquake waves,
  • and ocean waves all require
  • matter to transfer energy

2
Waves Medium
  • Electromagnetic
  • waves can
  • transmit energy
  • through a
  • vacuum or empty
  • space.

3
How does medium affect wave behavior?
  • Wave behavior is
  • affected by the
  • type of medium
  • the wave interacts
  • with or travels
  • through.

4
Light Waves and Media
  • In order for you to see
  • any object, the object
  • must give off light.
  • Objects give off light in
  • only two ways
  • Being luminous
  • Being illuminated

5
Light Waves and Media
  • Luminous objects are those that
  • emit their own light
  • Illuminated objects are those
  • that can reflect light to your eyes
  • The amount of light that is
  • reflected from an object
  • depends on the surface of the
  • object.

6
Light Waves and Media
  • A smooth surface reflects more light than a rough
    surface
  • This occurs because a rough surface scatters
  • reflected light in many different
  • directions

7
Light Waves and Media
  • Have you ever noticed that an
  • asphalt driveway seems hotter
  • on a summer day than a
  • concrete sidewalk

8
Light Waves and Media
  • This occurs because light that is
  • not reflected from the surface of
  • an object may be absorbed by the
  • object and converted to thermal
  • energy

9
Light Waves and Media
  • The color and surface texture of a
  • material have an effect on
  • whether how easily light is
  • absorbed by the object
  • Smooth and light colored objects
  • reflect more light than they absorb

10
Light Waves and Media
  • Objects with a rough texture and
  • dark color absorb more light than
  • they reflect
  • A dark rough textured object will
  • often feel hotter than a smooth,
  • light colored object

11
Shape Affects Deflection
  • When light rays reflect from
  • a surface they do so in a
  • predictable way that is
  • explained by the Law of
  • Reflection

12
Shape Affects Deflection
  • The Law of Reflection states
  • that the angle at which any
  • wave strikes a reflecting
  • surface is equal to the angle
  • at which the wave is reflected from the
    surface

13
Shape Affects Deflection
  • The angle at which a wave
  • strikes a surface is called the
  • angle of incidence
  • The angle of at which a wave is
  • reflected from a surface is called the angle
    of reflection

14
Shape Affects Deflection
  • According to the Law of
  • Reflection, the angle of
  • incidence is equal to the angle
  • of reflection
  • The shape of a surface affects how it reflects
    light.

15
Shape Affects Deflection
  • A plane mirror is a
  • mirror with a flat
  • surface
  • Light striking a plane
  • mirror is reflected
  • straight back, resulting in an upright image
    that is the same size as the original object

16
Shape Affects Deflection
  • Curved mirrors reflect at an
  • angle, producing different
  • kinds of images

17
Shape Affects Deflection
  • A convex mirror curves outward,
  • resulting in an image your eyes
  • detect as upright and reduced in
  • size
  • The side mirrors on cars are convex mirrors

18
Shape Affects Deflection
  • A concave mirror curves inward,
  • taking the shape of the inside of
  • a bowl
  • If an object is very close to the
  • mirror, light is reflected in a way that an
    enlarged, upright image is produced.

19
Shape Affects Deflection
  • If the object is very far way,
  • the image is reduced in size
  • and upside down

20
Transmission of Light
  • Many materials are classified
  • according to how well they
  • transmit light
  • A material that permits light to
  • pass through is transparent

21
Transmission of Light
  • Whether or not an object is
  • transparent depends on how
  • much and what colors of light it
  • transmits
  • You can see through the transparent materials
  • Air and clear glass are examples of common
    transparent materials

22
Translucent
  • Translucent materials transmit
  • some light but also scatter
  • light in all directions
  • Frosted glass and waxed paper
  • are translucent materials

23
Translucent
  • Opaque materials allow no light
  • to pass through
  • wood, carpet, and ceramic plates
  • are examples of opaque objects

24
Media and Wave Speed
  • The speed at which a wave travels is called wave
    speed
  • Wave speed is affected by the medium through with
    a wave travels
  • Mechanical waves require matter to transmit
    energy

25
Media and Wave Speed
  • The more densely packed the
  • matter, the more quickly the
  • energy is transmitted
  • Sound travels more quickly
  • through solids than through liquids or gases

26
Media and Wave Speed
  • When waves travel through gases, the temperature
    of he media affects the wave speed of sound
    waves.
  • The higher the temperature of the gas, the faster
    the particles will move
  • Light and other types of electromagnetic waves do
    not require matter to transmit energy

27
Media and Wave Speed
  • In a vacuum all
  • electromagnetic waves travel
  • at the same speed, 300,000
  • kilometers per second
  • When such waves encounter
  • matter, their speed will
  • change, depending upon how
  • they interact with the matter
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