Physical Science Class

Today’s Topics:

Waves and Wave Properties

To begin class..To begin class..Open your Science NotebooksOpen your Science Notebooks

• What do you think of when you hear the word wave?

• Write a brief description in your science notebook of what you think a wave is

How can we describe a wave?

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

Let’s Review Key TermsMedium: the matter a wave passes throughAmplitude (height): the distance a medium

rises or falls from its resting pointWavelength: 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

Longitudinal vs. Transverse Longitudinal vs. Transverse WavesWaves

Let’s view a simulation Let’s view a simulation

http://www.animatedscience.co.uk/blog/http://www.animatedscience.co.uk/blog/wp-content/uploads/focus_waves/tl-wp-content/uploads/focus_waves/tl-wave.htmlwave.html

Surface WavesSurface Waves

A A combinationcombination of oftransverse transverse and and longitudinallongitudinal..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

Let’s watch and see how a wave’s Let’s watch and see how a wave’s crest builds…crest builds…

http://news.bbc.co.uk/2/hi/4136289.stmhttp://news.bbc.co.uk/2/hi/4136289.stmThis shows a simulation on how a tsunami is This shows a simulation on how a tsunami is

formedformed

You Tube has many videos of the 2004 Tsunami waves and the destruction

Parts of a WaveParts of a WaveThe The wavelengthwavelength, , λλ, of a wave is the , of a wave is the

distance from any point on one wave to distance from any point on one wave to the same point on the next wave alongthe same point on the next wave along

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

Parts of a WaveParts of a WaveThe The amplitudeamplitude, , aa, of a wave is the , of a wave is the

distance from the centre line (or the still distance from the centre line (or the still position) to the top of a crest position) to the top of a crest oror to the to the bottom of a trough. Measured in metersbottom of a trough. Measured in meters

Parts of a WaveParts of a WaveThe The frequencyfrequency, , ff, of a wave is the number , of a wave is the number

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

Video - Parts of a WaveVideo - Parts of a Wave

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

Let’s Play!! Waves Review and Practice

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 1?A wave is a disturbance that transfers

______ from 1 place to another

energy

light

matter

water

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 2?Name the 3 types of waves

Ocean, land, water

Compression, longitudinal, surface

Transverse, surface, compression

Longitudinal, transverse, surface

$100

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 3?How is amplitude measured in units?

feet

yards

meters

Meters/seconds

$200

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 4?The distance crest to crest is:

amplitude

wavelength

frequency

meters

$500

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 5?1 hertz is equal to 1 wave per _________

inches

second

hour

minute

$1000

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 6?Ocean waves are _______

Compression waves

Longitudinal waves

Transverse waves

Surface waves

$5000

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 7?Transverse waves move:

Up and down

circular

Side to side

longitudinal

$10,000

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 8?Frequency of a wave is the # of

waves passing a point in:

1 minute

A certain time

1 hour

Meters per second

$50,000

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 9?Hz stands for

height

Hertz/second

hertz

horsepower

$100,000

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 10?The matter a wave passes through is:

matter

soil

air

medium

$50,000

$1,000,000$500,000$100,000$50,000$10,000$5000$1000$500$200$100

Is this your Final Answer?

Yes No

Question 11?

Wrong Answer

Wrong Answer

Correct Answer

Wrong Answer

$1,000,000