# MAY 12, 2014 Homework: Read pages 15-16 (Stop at Longitudinal Wave) in Sound and Light textbook- Define bold terms. -Unit vocabulary sheet due Friday Do.

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MAY 12, 2014 Homework: Read pages 15-16 (Stop at Longitudinal Wave) in Sound and Light textbook- Define bold terms. -Unit vocabulary sheet due Friday Do Now: Write down homework Open textbook to pg. 14 Open notebook to page 30

What are Waves?

A wave is a disturbance that transfers energy from place to place. How does a wave travel?

Medium : The material that a wave travels through Solids- Like ropes Liquids- Such as water- Water waves use the medium of the surface of the water to travel.

Gases - Like air- For Sound Waves

MAY 13, 2014 Homework: Work on Unit Vocabulary Sheet- Due Friday Work on Vocabulary Card Do Now:  Write Down Homework  Open notebook to pg. 30  Open textbook to pg. 15

HOW ARE WAVES CREATED?  Waves are created when a source of energy causes a medium to vibrate.

 A Vibration- is a repeated back and fourth or up and down motion

WAVES AND ENERGY  Waves travel through a medium, but do they carry the medium itself along with it as it travels? – Look at Figure 1 on pg. 15- What happens to the top of the wave over time? -A wave moves through the medium (water), but it does not carry the medium along with it.

TRANSVERSE WAVES  Waves that move the medium at right angles to the direction that the waves are traveling.  -Move in one direction- Waves that move up and down or side to side. -Waves are classified according to how they move

Crest- Highest parts of the wave Trough- The lowest part of the wave

MAY 14, 2014 ~Homework : Read /review the words & diagrams on pages 18-21 in T.B ~Do Now~  Write down homework  Open textbooks to page 16, Open notebooks to pg. 31. Title 31- Other types of waves  Read pg. 16- Longitudinal Waves and page17-  Then Define bold terms- in notebook on pg. 31

LONGITUDINAL WAVES Compressions- the parts that are close together Rarefactions- Parts where the coils are spread out Energy travels parallel along the spring toy- creating a wave- once the wave passes each coil goes back to normal

SURFACE WAVES Combination of Transverse and Longitudinal Waves. -Circular type motion

 Homework: Questions on the board-  ---  --  ---  ---   Finish wave diagrams if not finished in class.  Quiz on Section 1 and Section 2 on Wednesday 5-21 Do Now:  Write Down homework & Quiz information  Take out both Wave diagrams- Transverse (folded sheet of paper) and Longitudinal (half –sheet of paper)  Open textbook to pg. 18- Open notebook to page 32

PROPERTIES OF WAVES  Amplitude  Wavelength  Frequency  Speed

It is the maximum distance the medium moves above or below the rest position. Amplitude- The measure of how far a particle in the medium moves from rest when disturbed by a wave. Amplitude is a direct measure of the waves energy (From Rest –Crest) (From rest to trough)

Wave length- Distance between two corresponding (alike) parts of a wave- Crest to Crest Measured from Trough to Trough Wavelength Transverse Wave

Longitudinal wave- Wavelength is measured from compression to compression

AMPLITUDE- LONGITUDINAL WAVE  Measured by how compressed or rarefied the medium become.  The more crowded the compressions = the larger the amplitude.

Wave length- Distance between two corresponding (alike) parts of a wave- Crest to Crest Measured from Trough to Trough Wavelength Transverse Wave

Homework: -Review notes for quiz on Wednesday – May 21 -Complete review work sheet on Labeling Waves Do Now: -Write down homework -Take out Wave diagrams -Open textbook to pg. 19 -Open notebook to page 32

It is the maximum distance the medium moves above or below the rest position. Amplitude- The measure of how far a particle in the medium moves from rest when disturbed by a wave. Amplitude is a direct measure of the waves energy (From Rest –Crest) (From rest to trough)

AMPLITUDE- LONGITUDINAL WAVE  Measured by how compressed or rarefied the medium become.  The more crowded the compressions = the larger the amplitude.

Wave length- Distance between two corresponding (alike) parts of a wave- Crest to Crest Measured from Trough to Trough Wavelength Transverse Wave

Longitudinal wave- Wavelength is measured from compression to compression

FREQUENCY - Measured in hertz (Hz)  The number of complete waves that pass a given point in a certain amount of time. Frequency = (Wave) speed Wavelength Ex: To increase the frequency you need to increase the amount of vibrations.

FREQUENCY - EX: If waves on a rope pass by every second, the frequency is 1 wave per second (1 Hz) 1. 2.2. 3. Waves are…… vibrations in a medium- Frequency = Number of Vibrations(Waves) that pass per second-

~~~~SPEED OF A WAVE~~~~  Why do you see the lightning before you hear the thunder??  Lightning and Thunder~~Speed of Sound vs. Speed of light! Who is faster???? Speed = Wavelength x Frequency

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