13.1 : wave basics / wave properties · waves phases wave phases • a waves phase is the position...
TRANSCRIPT
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13.1 : Wave Basics / Wave Properties
• Waves • Mechanical Waves • Amplitude • Frequency / Period • Wavelength • Wave Phases • Wave Speed
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Medium A medium is the material, which a wave travels through (Solid, liquid, or a gas). Examples: o The medium of a water wave is the water o The medium of a sound wave is the air o The medium of a wave on a string is the string
Waves
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Pulse A single disturbance in a medium What is a wave? • A wave is a vibration or disturbance that propagates
though a medium or space.
• A series of pulses
• A waves “job” is to carry energy from one point to another.
• All waves transfer energy but not mass.
Waves
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2 Types of Waves: Mechanical A mechanical wave is created when a source of energy causes a vibration to travel though a medium. Example: Sound Waves Electromagnetic Waves that do not need a medium (matter) to transfer energy Example: Light Waves (Section #14)
Waves
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• Uses matter (medium) to transfer energy. • The energy is transferred from particle to particle as they
collide
Mechanical Waves
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There are 2 types of Mechanical Waves: Transverse Waves • Medium vibrates perpendicular (90º) to the direction the
energy travels
Mechanical Waves
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Transverse Waves Examples:
1. Shaking the end of a rope up and down 2. Shaking one end of the blanket up and down 3. Wave in the ball park
Transverse Waves
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Transverse Waves Properties Crest The highest point of the wave above the rest position. (The top of the “hill”) Trough The lowest point of the wave below the rest position. (The “valley” of the wave)
Transverse Waves
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Longitudinal Waves A wave in which the medium vibrates parallel to the direction the energy travels. (sound)
Longitudinal Waves
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Longitudinal Wave Properties Compression An area where the particles in a medium are spaced close together. Rarefaction An area where the particles in a medium are spread out.
Longitudinal Waves
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Longitudinal Waves Properties
Longitudinal Waves
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Longitudinal Waves Examples:
1. Waves produced by earthquakes 2. Sound Waves 3. Ultrasound
Longitudinal Waves
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Longitudinal Waves
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Transverse and Longitudinal Waves
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Amplitude The maximum distance (m) from the rest position of a wave to the top of a crest or the bottom of a trough.
Wave Characteristics
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Amplitude The greater the amplitude of a wave then the more energy it is carrying
Wave Characteristics
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Frequency Number of wavelengths to pass by a given point in 1 second Symbol: f Units: Hz
Wave Characteristics
f = #of _waves#of _seconds
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Which one of these waves has a higher frequency?
Wave Characteristics
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Period The time required for one complete wave to pass a certain point. Symbol: T Units: seconds
Wave Characteristics
T = #of _seconds#of _waves
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Period and Frequency Relationship
T = 1f f = 1
T
Wave Characteristics
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Example #1 10 complete waves pass in 5 seconds
a. What is the frequency of the wave? b. What is the period of the wave?
f = 2 Hz T = 0.5 seconds
Wave Characteristics
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Wavelength Length of one complete wave.
o 1 complete wave ~ 1 whole crest AND 1 whole trough Symbol: λ (lambda) Units: m
Wave Characteristics
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Wavelength
Wave Characteristics
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Wavelength
Wave Characteristics
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Note: When frequency increases, wavelength decreases.
Wave Characteristics
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Which one of these waves has a larger wavelength (λ)?
Wave Characteristics
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Exercise Draw two waves that have the same amplitude but different wavelengths.
Wave Characteristics
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Exercise Draw two waves that have the same wavelength but different amplitudes.
Wave Characteristics
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Waves Phases
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Waves Phases
Wave Phases • A waves phase is the position of a point in time (an instant) on
a waveform cycle.
• A complete cycle is defined as the interval required for the waveform to return to its “initial position”.
• The graph below shows how one cycle constitutes 360º of phase.
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Waves Phases
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Phase difference
Here the phase difference is ½ a wavelength which is 180º
Phase difference between waves • Waves of same amplitude, wavelength, frequency, can still be
“different”. • There can be phase differences between waves
Waves Phases
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Waves Phase
Which points are in phase with point “A”? “E” and “I” Which Points are in phase with point “C”? “G”
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Waves Phase
Which Points are 180º out of phase with “A”? “C” and “G” Which Points are 90º out of phase with “B” and “F”? “A”, “C”, “E”, and “G”
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Waves Phase
A
B
C
D
E
F
G
H
I
Exercise Label the points on the waveform next to the degree they represent in the circle
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Formula V = f x λ Speed: m/s Frequency: Hertz (Hz) Wavelength: meters (m)
Wave Speed The speed of a wave is how fast the wave is traveling
Wave Speed
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Wave Speed Problems
Example #1 A sound wave in a steel rail has a frequency of 620 Hz and a wavelength of 10.5 m. What is the speed of sound in steel?
V = f x λ V = 620 hz x 10.5 m 6,510 m/s
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Wave Speed Problems
Example #2 What is the speed of a wave with a frequency of 760 Hz and a wavelength of 0.45 m
V = f x λ V = 760 hz x 0.45 m 342 m/s
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Wave Speed Problems
Example #3 A wave has a period of 0.25 seconds and a wavelength of 3 meters. What is the speed of the wave?
V = f x λ V = 4 hz x 3 m 12 m/s
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Wave Speed Problems
Example #4 The wave below has a period of 0.05 seconds. What is the speed of the wave?
V = f x λ V = 20 hz x 4 m 80 m/s