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

May 15, 2014

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

May 16, 2014Homework: -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.

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