warm up what is a wave? name all the parts of a wave you can think of name all the different kinds...
TRANSCRIPT
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Warm Up
• What is a wave?
• Name all the parts of a wave you can think of
• Name all the different kinds of waves you can think of
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Wave – a disturbance that travels through space and time, usually transmitting energy.
Properties of Waves
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Waves have several parts to them…
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The normal is where the medium would be if there were no wave.
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The normal is shown as a dotted line here.
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The crest is the part of the wave that goes above the normal.
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The trough is the part of the wave that goes below the normal.
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Crest, Trough, Wavelength, Amplitude.
Momentum
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Crest, Trough, Wavelength, Amplitude.
Momentum
Crest
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Crest, Trough, Wavelength, Amplitude.
Momentum
Crest
Trough
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Crest, Trough, Wavelength, Amplitude.
Momentum
Wavelength
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Crest, Trough, Wavelength, Amplitude.
Momentum
Wavelength
Am
plit
ud
e
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Properties of Waves
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Properties of Waves
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Mechanical Wave – a wave that requires a material in which to travel.
Properties of Waves
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Electromagnetic (visible light) waves, radio waves, microwaves and X-rays can travel through a vacuum like space
Properties of Waves
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Properties of Waves
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2 Types of waves:Properties of Waves
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2 Types of waves:Transverse Waves – a wave whose particles vibrate perpendicularly to the direction of wave motion.
Properties of Waves
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Crest
Properties of Waves
2 Types of waves:Transverse Waves
Trough
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So remember… when the particles move
perpendicular to the energy, you have a transverse wave.
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2 Types of waves:Longitudinal (Compression) Wave – a wave whose particles vibrate parallel to the direction of wave motion.
Properties of Waves
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2 Types of waves:Longitudinal Wave
Properties of Waves
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2 Types of waves:Longitudinal Wave
Properties of Waves
Compression
Rarefaction
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Longitudinal waves don’t have crests and troughs like transverse waves.
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Instead they have areas of bunched up particles,
and areas of spread apart particles.
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The areas of bunched up particles are
compressions. (look up top!)
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The areas of spread apart particles are
rarefactions. (look on the
bottom)
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On a transverse wave, the wavelength is the distance between two crests or troughs.
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On a longitudinal wave, wavelength is the distance between compressions or
rarefactions.
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Instead of writing “wavelength” all the time, scientists use the Greek letter lambda to represent wavelength.
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Lambda =
wavelength
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Properties of Waves
Wavelength
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The amplitude of a transverse wave is how far from the normal the medium moves.
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The amplitude of a longitudinal wave is the
thickness of the compressions.
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The amplitude of a wave tells us how much energy is in the wave. Larger amplitude means
more energy!
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AmplitudeProperties of Waves
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Frequency (f) – Hertz – number of complete cycles (1 crest and 1 trough) per second.
(2 Hz = twice per second)
Properties of Waves
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The light blue wave here has the smallest frequencyfrequency. You can tell because it has the longest wavelengthwavelength.
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The blue wave has the greatest frequencyfrequency. You can see it has the smallest wavelength.
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FrequencyFrequency is measured in a unit called hertz (Hz).hertz (Hz).
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One Hz Hz means that one crest passes a given point each second.
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Period (T) – amount of time required for one complete vibration.
Properties of Waves
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Properties of Waves
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Properties of Waves1 second
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Frequency and Period are inversely related.
High frequency = low periodLow frequency = high period
Properties of Waves
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Frequency and Period are inversely related.
f = 1 T = 1 T f
Properties of Waves
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Wave Speedv = f λ
v = velocity of wave (m/s)f = frequency (Hz)λ = wavelength (m)
Properties of Waves
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The piano string tuned to middle C vibrates at 264 Hz. Assuming the speed of sound is 343m/s, what is the wavelength of the sound?
Properties of Waves
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The piano string tuned to middle C vibrates at 264 Hz. Assuming the speed of sound is 343m/s, what is the wavelength of the sound?
Properties of Waves
v = f λ
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The piano string tuned to middle C vibrates at 264 Hz. Assuming the speed of sound is 343m/s, what is the wavelength of the sound?
343 =
Properties of Waves
v = f λ
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The piano string tuned to middle C vibrates at 264 Hz. Assuming the speed of sound is 343m/s, what is the wavelength of the sound?
343 = 264(λ)
Properties of Waves
v = f λ
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The piano string tuned to middle C vibrates at 264 Hz. Assuming the speed of sound is 343m/s, what is the wavelength of the sound?
λ = 1.3m
Properties of Waves
v = f λ
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Green Light has a wavelength of 5.25x10-7
m. If the frequency is 5.71x1014 Hz, how fast
does green light travel?
Cool Down
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Green Light has a wavelength of 5.25x10-7m. If the frequency is 5.71x1014 Hz, how fast does
green light travel?
Momentumv = f λ
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Green Light has a wavelength of 5.25x10-7m. If the frequency is 5.71x1014 Hz, how fast does
green light travel?
v = (5.71x1014)(5.25x10-7)
Momentumv = f λ
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Green Light has a wavelength of 5.25x10-7m. If the frequency is 5.71x1014 Hz, how fast does
green light travel?
v = 299,775,000m/s2.99x108m/s
Momentumv = f λ
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Exit Slip
1. Draw a diagram of a wave and label the parts