Intro to Wave Interactions

Thursday, March 15, 2012

D. Goldsberry 3/15/2012

1) Get your journals. Find the next

available page.

2) Complete the Warm-Up Exercise

for March 15th

3) Help pass back graded papers.

4) Time Limit: 7 minutes

D. Goldsberry 3/15/2012

D. Goldsberry 3/15/2012

Practice Sheet #24

is due tomorrow.

If you use your pass, staple

it to the sheet and fill in the

answers during class

review.

David Orekoya

Chloe Roberson

Janell Banks

Frank Rivera

Nick Valvis

Cameron Johnson

Allen Cooper

LaDaish Franklin

Brian Suggs

Julissa Pineda-Espinosa

Brendalyn Bleetan

Evan Sullivan

Jairo Roque

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Kat Spearmon

Dwayne Watson

Emma Fiester

Ajani Kerr

Evelyn Chahuich

Yanitzie Cruz

Jessya Nelson

Lonniesca Boles

Juliana Lubin

Aaron Preston

Sha’nejah Smalls

Kaia Riley

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Taylore Matthews

Bre’Shona Sellers

Kenton Pascoe

Alicia Ricks

Lesleigh Knotts

Deyana Saintdic

Morgan Brown

Amari Milhouse

Alexia Sellers

Brandon Gregory

D. Goldsberry 3/15/2012

Adrin Williams

Dominique Jones

Mikyla Carter

Irving Garcia

Zahria Holmes

Na’tia Shaw

Ja’Quan Hodges

Allissa Ruocchio

Alexus Martinez

Nicholus Young

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S8P5: Students will

explore the wave nature

of sound and

electromagnetic radiation.

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a. Identify the characteristics of

electromagnetic and mechanical

waves.

d. Describe how the behavior of waves is

affected by medium (such as air, water,

solids).

e. Relate the properties of sound to

everyday experiences.

f. Diagram the parts of the wave and

explain how the parts are affected by

changes in amplitude and pitch. D. Goldsberry 3/15/2012

Pitch is

The longer in vibrating object….

a) the lower the pitch

b) lower (or smaller) the frequency

c) bigger the wavelength of the sound

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Pitch is

The shorter in vibrating object….

a) the higher the pitch

b) higher (or bigger) the frequency

c) smaller the wavelength of the sound

Wavelength and frequency have an

inverse relationship!

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Wavelength and

frequency have an

inverse relationship.

When one gets bigger,

the other gets smaller.

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How can sound be

destructive?

http://www.archive.org/details/SF121

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Natural Frequency

Most objects have a natural

frequency of vibration.

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Natural Frequency

For example, if a guitar string

(fastened at its end on a guitar) is

plucked, the waves created vibrate

at the string’s natural frequency.

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Natural Frequency

If you change the length of the

string, you will also change its

natural frequency.

Demo-- Singing Rods

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Resonance A phenomenon called resonance is

very important in physics because it

occurs in many mechanical and

electrical systems.

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Resonance

Resonance is the transfer of

energy from one system to

another that vibrates at the same

frequency (its natural frequency).

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http://www.regentsprep.org/Regents/physics/phys04/bresonan/default.htm

http://www.acoustics.salford.ac.uk/feschools/waves/wine2video.htm

http://www.acoustics.salford.ac.uk/feschools/waves/wine1video.htm

D. Goldsberry 3/15/2012

D. Goldsberry 3/15/2012

Practice Sheet #24

is due tomorrow.

If you use your pass, staple

it to the sheet and fill in the

answers during class

review.

Let’s investigate what

happens when one wave

runs into a new medium.

D. Goldsberry 3/15/2012