Waves - PowerPoint PPT Presentation

Loading...

PPT – Waves PowerPoint presentation | free to download - id: 4a0913-YjJjN



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Waves

Description:

Waves Definitions of Waves A wave is a traveling that carries through space and matter without transferring . Transverse Wave: A wave in which the disturbance ... – PowerPoint PPT presentation

Number of Views:29
Avg rating:3.0/5.0
Slides: 24
Provided by: Char260
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Waves


1
Waves
2
Definitions of Waves
  • A wave is a traveling that carries
    through space and matter without transferring
    .
  • Transverse Wave A wave in which the disturbance
    occurs to the direction of travel.
  • A type of transverse wave is
  • Longitudinal Wave A wave in which the
    disturbance occurs to the direction of travel
    of the wave.
  • A type of longitudinal wave is
  • Surface Wave A wave that has charact-eristics of
    both and waves.

3
Types of Waves
  • Mechanical Waves Require a such as ,
    , of a spring or the fabric of a rope.
  • Electromagnetic Waves can travel in the
    absence of a medium.

4
Transverse Wave Characteristics
  • Crest .
  • Trough .
  • Amplitude (undisturbed position).

John Wiley Sons
5
Transverse Wave Characteristics (cont.)
  • Frequency(f) The number of the wave makes
    in
  • The unit for frequency is
  • Wavelength(?) The minimum at which the
    wave repeats the same pattern
  • A single oscillation is also called a
  • The units for wavelength are

6
Transverse Wave Characteristics (cont.)
  • Velocity (v) of the wave
  • Measured in
  • The formula to calculate the speed of a wave is
  • Period (T) it takes for the wave to complete
    one
  • The units for period is
  • The formula to calculate the period is

7
Transverse vs. Longitudinal Waves
8
The Relationships v f?
  • The of a wave is determined by the in
    which it travels.
  • That means that for a given medium
  • and are inversely proportional.
  • As one , the other

9
The Inverse RelationshipsT
  • As the period , the .

10
Speed of a Wave on a String
  • For a stretched rope or string
  • Where
  • Tension
  • linear density
  • As the tension , the speed .
  • As the mass , the speed .
  • This phenomena is commonly seen in

11
Waves at Boundaries
  • A wave incident upon a fixed boundary will have
    its reflected back in the opposite
    direction. Note that the wave pulse is after
    reflecting off the boundary.

www.electron4.phys.utk.edu
12
Interference
  • occurs whenever two waves occupy the same
    space at the same time.
  • Law of When two or more waves are present
    at the same time at the same place, the
    disturbance is equal to the of the
    disturbances from the individual waves.

13
Wave Interference
Interference Process by which two waves
meet producing a net amplitude.
www.electron4.phys.utk.edu
14
Wave Interference
15
Waves
  • Wave An interference pattern resulting
    from two waves moving in directions with the
    same and such that they develop a
    consistent repeating pattern of and
    interference.

16
Waves
  • Node The part of a standing wave where
    interference is at all times ( o out of
    phase).
  • Antinode The part of the wave where interference
    is maximized ( ).

17
Waves
  • When a wave impacts a boundary, some of the
    energy is , while some passes , or may be
    .
  • The wave that passes through is called a
    wave.
  • A wave that is transmitted through a boundary
    will lose some of its energy.
  • Electromagnetic radiation will both down and
    have a wavelength when going into a denser
    media.
  • Sound will when transitioning into a denser
    media.

18
Continuous Waves Higher Speed to Lower Speed
  • Note the differences in wavelength and amplitude
    between of the wave in the two different mediums

Incident Reflected Wave
Transmitted Wave
Displacement
Lower speed Shorter wavelength
Higher speed Longer wavelength
Note This phenomena is seen with light traveling
from air to water.
19
The Wave Equation
  • waves can be represented by the following
    equation.
  • y(x,t) ymsin(?t - ?x)
  • Where
  • ym
  • ? (2?/?)
  • x
  • ? (2?f)
  • t
  • Note that the sum (?t - ?x) is in , not degrees.

20
The Wave Equation
  • y(x,t) ymsin(?t - ?x)
  • ? 2?/?
  • Waveform
  • repeats itself every .
  • ? 2?f
  • Waveform
  • travels through 1
  • (T) every .
  • A phase constant (?) can be included in the phase
    that represents all waves that do not pass
    through the origin.

21
The Wave Equation An Alternate Representation
  • y(x,t) ymsin(?t - ?x)
  • Substituting for ? (2?f), ? (2?/?) and ym (A)
    yields
  • y(x,t) Asin2?(ft - x)
  • or
  • y(x,t) Asin2?(vt - x)

1 ?
?
22
Key Ideas
  • Waves transfer without transferring .
  • Longitudinal waves like that of sound require a
    .
  • Transverse waves such as electro-magnetic
    radiation (light) do not require a .
  • In transverse waves, displacement is to the
    direction of the wave while in longitudinal
    waves, the displacement is .

23
Key Ideas
  • Waves can with one another resulting in
    or interference.
  • waves are a special case of constructive and
    destructive interference for two waves moving in
    opposite directions with the same , and
    .
About PowerShow.com