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WAVES
Chapter 25May 2 & 3
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• Do Now: Turn in HW. Take a clicker. Observe the demo. Teacher will assign groups – you have 3 minutes with your group to draw what you see and LABEL the following terms correctly:– crest – Trough – Amplitude – Node
• HW: p. 388 #1-9, 11-13 in the POST section of your packet. *Will not be collected, but expect an open notes quiz to see if you completed the assignment * (This will be the case from now until the end of the year…you will have a few projects, several quizzes/labs, 1 test, and 1 Quest, and a Final exam.)
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What is a wave?
• A vibration or disturbance.• A wiggle in space and time• Any other definitions? • SOUND & LIGHT are forms of energy that
travel in waves.• However, they travel in different types of
waves… to be discussed later!
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On your paper, try to label the key terms MORE THAN ONCE:
crest, trough, amplitude, wavelength
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Using your vocab HW…
• Fill out the ‘frequency’ and ‘period’ boxes.• We will review in a few moments.
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Frequency (ƒ)
• How OFTEN a wave happens• How FREQUENTLY a wave happens• # of cycles in one second.• # of waves in one second.• Measured in Hertz (Hz).• 1 Hz = 1 cycle per second• “When a frequency is too high, it HERTZ your
ears!”– Becca Caplinger
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Period (T)
• The TIME PERIOD for one wave• A period is the time it takes for one cycle.• 1 cycle = 1 complete trip– 1 trip back & forth– Around and back to the same point– 1 wave = 1 cycle
• Measured in seconds
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period = 1 frequency
frequency = 1period
See board for formula in symbols!
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Analogy• One class PERIOD at Rville is 90 minutes.
(time it takes for 1 class)• You have 1 class per 90 minutes, which is how
FREQUENTLY you have classes
T = 90 minutes f = 1 class 90 minutes
• They are inverses!
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True or false: When a wave travels in a medium (material) the medium moves
with the wave.
1 2 3 4
81%
8%0%
12%
1. True2. False3. Not enough info4. Not quite sure
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Jump rope demo
• Write down your observations…. • It’s not the medium that moves with the
wave… it is the ENERGY that is transmitted! The energy moves!
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But wait – what’s a medium?
• It’s not someone who summons spirits.• It’s synonym for material!• Different types of solids, liquids, and gases are
all examples of mediums.• Changing the TEMPERATURE changes the
medium:– Example: temperature in this room vs temp.
outside: different temps, different mediums (even though they are both air!)
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Formula in words:
Wave speed = wavelength x frequency
Formula in symbols: Units: (m/s) = (m) x Hz
25.4 Wave Speed The speed of the wave depends on the
______________________________through which the wave movesIf the MEDIUM doesn’t change, then the WAVESPEED doesn’t change! (KEY POINT)
Medium or material
SEE THE BOARD!
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You SEE lightening and THEN hear thunder. What does this tell you about
the speed of sound vs. the speed of light?
1 2 3 4 5
100%
0% 0%0%0%
1. Light is faster2. Sound is faster3. They are the same
speed4. Not enough info5. Not quite sure
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Does wave speed depend on AMPLITUDE (hint - check the formula)?
1 2 3 4
23%
5%0%
73%1. Yes 2. No 3. Not enough info4. Not quite sure
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Slinky Wave Lab• Safety Rules:• All labs must be completed with the slinky FLAT
on the floor• Damaging, twisting, tangling, or otherwise
rendering the slinky useless will result in one or more of the following:– Write up– Loss of lab privileges– You buying me a new slinky
• Have fun! Stopping with 5-10 minutes left for a clicker exit!
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Observe the demo: is this a transverse or longitudinal wave?
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0% 0%0%0%
1. Transverse2. Longitudinal 3. Not enough info4. Not quite sure
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Observe the demo: is this a transverse or longitudinal wave?
1 2 3 4
0% 0%0%0%
1. Transverse2. Longitudinal 3. Not enough info4. Not quite sure
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These waves travel towards each other…
the result is..?
1 2 3 4
0% 0%0%0%
1. Constructive interference 2. Destructive interference 3. Not enough info4. Not quite sure
They CONSTRUCT a bigger wave!
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These waves travel towards each other…
the result is..?
1 2 3 4
0% 0%0%0%
1. Constructive interference 2. Destructive interference 3. Not enough info4. Not quite sure
They DESTRUCT The wave!
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1 0.5
1.5 2
2.5 3
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What do your answers tell you about wavelength and frequency? Are they
directly or inversely proportional?
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0% 0%0%0%
1. Directly2. inversely3. Not enough info4. Not quite sure
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Inversely!!!
λ f = ν = λ f When the waves were MORE FREQUENT,You observed SHORTER WAVELENGTHS!