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Physical Science Class

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Today’s Topics:

Waves and Wave Properties

- What do you think of when you hear the word wave?
- Write a brief description in yourscience notebook of what you think a wave is

- A Wave is disturbance that transfers energy from 1 place to another

- Medium: the matter a wave passes through
- Amplitude (height): the distance a medium rises or falls from its resting point
- Wavelength: the distance from any 1 point on a wave to an identical point on the next weave. This measures the length of 1 cycle

Image source:

http://www.physicsclassroom.com/class/waves/Lesson-1/Categories-of-Waves

- Let’s view a simulation
- http://www.animatedscience.co.uk/blog/wp-content/uploads/focus_waves/tl-wave.html

Surface Waves

A combination of

transverse and longitudinal.

An example is an Ocean Wave: As a wave travels through the medium (water), the particles of that medium travel in clockwise circles.

As a wave heads into shore, the top of the wave is free but the bottom of the wave becomes constricted, causing the wave´s crest to build. Eventually the water is unable to support the wave and it breaks

- http://news.bbc.co.uk/2/hi/4136289.stm
- This shows a simulation on how a tsunami is formed
You Tube has many videos of the 2004 Tsunami waves and the destruction

- This shows a simulation on how a tsunami is formed

- The wavelength, λ, of a wave is the distance from any point on one wave to the same point on the next wave along

Image courtesy of: http://www.bbc.co.uk/bitesize/standard/physics/telecommunications/communication_using_waves/revision/5/

- The amplitude, a, of a wave is the distance from the centre line (or the still position) to the top of a crest or to the bottom of a trough. Measured in meters

- The frequency, f, of a wave is the number of waves passing a point in a certain time. We normally use a time of one second, so this gives frequency the unit hertz (Hz), since one hertz is equal to one wave per second

- http://safeshare.tv/w/SkYbVfMRpv

Who Wants

to be a

Millionaire?

Let’s Play!! Waves Review and Practice

energy

light

matter

water

Is this your

Final Answer?

Yes

No

Ocean, land, water

Compression, longitudinal, surface

Transverse, surface, compression

Longitudinal, transverse, surface

Is this your

Final Answer?

Yes

No

$100

feet

yards

meters

Meters/seconds

Is this your

Final Answer?

Yes

No

$200

amplitude

wavelength

frequency

meters

Is this your

Final Answer?

Yes

No

$500

inches

second

hour

minute

Is this your

Final Answer?

Yes

No

$1000

Compression waves

Longitudinal waves

Transverse waves

Surface waves

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Final Answer?

Yes

No

$5000

Up and down

circular

Side to side

longitudinal

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Final Answer?

Yes

No

$10,000

1 minute

A certain time

1 hour

Meters per second

Is this your

Final Answer?

Yes

No

$50,000

height

Hertz/second

hertz

horsepower

Is this your

Final Answer?

Yes

No

$100,000

matter

soil

air

medium

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Final Answer?

Yes

No

$50,000

Wrong Answer

Wrong Answer

Correct Answer

Wrong Answer

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Final Answer?

Yes

No

$1,000,000

A

B

C

D

Poll the audience

?

C

B

D

A

?

?

?

Phone a friend

50 / 50