WAVE (Understanding Wave)

8/13/2019 WAVE (Understanding Wave)

http://slidepdf.com/reader/full/wave-understanding-wave 1/23

TEACHING AND LEARNING MODULES FOR PHYSICS

Form 4

Semester 2

Duration 40 minutes

Learning Area WavesLearning Objectives Understanding Waves

Learning Outcomes A student is able to :-

! describe "#at is meant b$ "ave motion%

2! recogni&e t#at "aves trans'er energ$ "it#out trans'er matter

(! )om*are transverse and longitudinal "aves and give e+am*les eac#%4! ,no" t#e de'inition o' "ave 'ronts%

! State t#e direction o' *ro*agation o' "aves in relation to "ave'ronts

.re-re/uisite: ,no"ledge S1ill #e conce*ts o' distance3 velocit$3 time3 and energ$

aterial L)D3)om*uter and slin1$ tan1%.edagog$: Strategies ec#ni/ues Demonstration and constructivism

Language Focus 5ocabular$ and science *rocess "ords3 'unction "ords

Scienti'ic and6or 7oble 5alue 8eing coo*erative3 s$stematic and inde*endent

9e'lection



Teaching And Learning Activities

Teachers Activities St!dents Activities "!esti#ns and E$%ected Ans&ers '#ca(!)ar*

% describe "#at

is meant b$"ave motion%

2! recogni&e

t#at "aves

trans'er

energ$

"it#out

ENGAGEMENT

! eac#er tries to attractt#e attentions o'

students b$ as1ing a

/uestion%

2! eac#er s#o"s a 'e"

e+am*les o'

oscillating or

vibrating s$stems

suc# as a s"ing3tuning 'or13 guitar

string3 "ater ri**leetc% A 'un activit$

"ould be to as1 a

student to sing

accom*anied a guitar

*la$er;!

(! eac#er tries to

engage students about

"aves b$ as1ing some

starter /uestionsA**endi+ A!

! teac#er s#o"s a series

o' *articles connected

b$ s*rings% As one

individual *article is

! Students t#in1 andans"er t#e /uestion%

%

From t#e video cli*s

! identi'$ t#e e+am*les o' "aves 'rom

t#e video cli*s

Ans: i!

ocean3tsunami3radio3telecommunication

"aves% eart#/ua1e

2! "#en a "ave *ro*agates3 it carries

energ$3< =es or no< "#at is a reason $ou

WaveWave'ront3

ranverse "ave

Longitudal "ave

5ibration

.ro*agation



trans'er

matter

disturbed3 it transmits

t#e disturbance to ne+t

interconnected

*article%

2! A tuning 'or1

mounted on a sound board%

said t#at<

Ans: i!

=es% )#ange in *#$sical

! W#at #a**ens "#en one individual

*articles is disturbed<

Ans%

>t transmits t#e disturbance to t#e ne+t

interconnected *article%

(! )om*are

tranverse and

longitudinal

"aves and

give

e+am*leseac#%

EXPLORATION AND

EXPLANATION

see a**endi+ 8!

A**endi+ )!



4! ,no" t#e

de'inition o'

"ave 'ronts%

! !State t#e

direction o'

*ro*agation

o' "aves in

relation to

"ave'ronts

W#at is "ave 'ronts<

.lane "ave'ronts

)ircular "ave'ronts

eac#er as1s students to

dra" a straig#t line as

"ave direction and a

tangent o' circular "ave

'ronts on a s1etc# o' a

circular t#at alread$ dra"

b$ student at ste* ii!

above%

iv! eac#er t#en veri'iest#e students ans"er% ?#e

direction o' *ro*agation

o' "aves is *er*endicular

to "ave 'ronts@%

EVALUATION

see a**endi+ ) !



A**endi+ A

Starter uestions:

% Bave $ou ever visited a beac#<

2% Do $ou "atc# t#e "aves moving in and brea1ing on t#e

s#ore< W#$ doesnCt t#e "ater accumulates on t#e beac#<(% >' $ou stand on a sur'ing board3 "#at "ill #a**en to $ou<

W#$ do $ou 'eel t#at t#e "ave carr$ $ou along or 1noc1

$ou over<

4% ive me some e+am*les o' "aves< Do $ou 1no" t#e

di''erent t$*es o' "aves<

eac#erCs ans"ers:

2%#e "ater does not accumulate on t#e s#ore because t#e

t t# t ! ti l ' t# di ! d t



A%%endi$ +

A%%endi$ ,

St!dents Activit* - L#ngit!dina) and Transverse .aves Si/!)ati#n

Activit* 0 - Transverve .aves 1the h!/an &ave2

Transverse waves are waves that move along a medium where the medium

moves perpendicular to the direction that the wave moves

Materials

15 to 20 students sitting in a row next to each other. There can be manystudents sitting in many rows just like at the football stadium which adds alittle excitement.

Instructions

1. tart at one end of the row and have the first students stand up and sitdown.

2. !ll other student in the row must wait and respond when the wave getsto them.

". #f students are to $uick to respond have them hold hands and close

th i i ti



Activity 2 : Longitudinal wave

! compression is characteri'ed by having a particle in the medium moveforward& bump into the next particle in the medium and then bounce back toits original position. This continues with each particle bumping its neighborand then returning to its original position thereby transmitting thedisturbance through the medium.

Materials

! group of people seated side by side and shoulder to shoulder in a row.+eople sitting on a bench (long chair) placed next to each other are in thecorrect orientation for this demonstration.

Instructions

1. #nstruct a person on one side of the room to bend and gently bumpshoulders with their neighbor and return to their normal position.

2. The person bumped responds by bending to bump shoulders with thethird person in line and so on.

Explanation



Activit* , - C#/%aring a transverse &ave and a )#ngit!dina) &ave3

% Students are to com*are t#e t"o "aves and come u* "it# a list o' similarities and

di''erences%

2% As1 t#e students to visit t#is "ebsite:

#tt*:66"""%1ettering%edu6Edrussell6Demos6"aves6"avemotion%#tml

http://www.kettering.edu/~drussell/Demos/waves/wavemotion.html

http://www.kettering.edu/~drussell/Demos/waves/wavemotion.html



A%%endi$ C

02 E$a/%)es #4 &aves 1 4r#/ vide# c)i%2

52 Si/i)arities in &aves &aves

,2 T*%e #4 &aves %r#%agati#n

62 E$a/%)es #4 )#ngit!dina) &aves

72 E$a/%)e #4 tranverse &ave



TEACHING AND LEARNING MODULES FOR PHYSICS

'orm 4

Semester

Duration 0 minutesLearning Area Waves

Learning Objectives Understanding "aves continuation!

Learning Outcome A student is able to:

G% De'ine i% am*litude ii% .eriod iii% Fre/uenc$ iv% Wavelengt# iv% "ave s*eed

H% S1etc# and inter*ret a dis*lacement-time gra*# 'or a "ave%% S1etc# and inter*ret a dis*lacement-distance gra*# 'or a "ave%

I% )lari'$ t#e relations#i* bet"een s*eed3 "avelengt# and 're/uenc$%

0% Solve *roblems involving s*eed3 "avelengt# and 're/uenc$%

% Describe dam*ing in an oscillating s$stem%

2% Describe resonance in an oscillating s$stem%

.rere/uisite

aterial 9esources

.edagog$ :

Strategies 6 et#od

#in1ing s1ills and t#in1ing strategies3 )onstructivism t#roug# >n/uir$ Discover$3 #aving discussions

7oble values

Learning

O!tc#/e

Teachers activities St!dents activities "!esti#n and e$%ected

ans&ers8 N#tes

'#ca(!)ar*

A student is able

to:

G% De'ine

i% am*litude

ENGAGEMENT

E9PLORATION AND

E9PLANATION

% Am*litude - am*litud

)rest J *unca1

Fre/uenc$ J

're1uensi

Oscillation J a$unan



eac#er as1ed student to 'orm

grou*s% Kac# grou* "as *rovided

A sim*le *endulum set as s#o"n

in *#otogra*# belo"

eac#er : move *endulum bob to

*oint 8 t#en *oint A and later

*oint ) as s#o"n in *#otogra*#

belo"

Once again teac#er instructed

student to move *endulum bob to

*osition A a+imum *oint!%

>nstruction: .lease measure a

distance bet"een A and 8%

>nstruction2: .lease measure a

distance bet"een ) and 8

eac#er clari'ication: >' A8 "e

consider *ositive direction3 so

-student to move *endulum bob to 8

*osition%

Student measure a

distance bet"een A and

8 b$ using a ruler%

Student measure a

distance bet"een 8 and

) b$ using a ruler%

Student 'ollo" as "#at#as been instructed%

Student ans"er: cm

Student ans"er: - cm

uestion: 7o"3 can $ou

de'ine ?am*litude@

Student ans"er: Am*litudeis a ma+imum

dis*lacement%

.endulum J bandul

.eriod J tem*o#

#roug# J

*alung6lembangan

Wave'ront J mu1a

gelombang



ii% .eriod

iii% Fre/uenc$

)8 "as negative direction%

Actuall$ A8 and )D is

am*litude 'or t#at oscillating

s$stem

.lease *ut $our *endulum bob to

*oint A and t#en let it oscillate

'reel$ 'rom A to 8 and ) and

return to A%

7o"3 b$ using sto* "atc# to ta1e

time 'or *endulum bob to

oscillate 'rom A to 8 and t#en )

and return to A%

Actuall$3 t#e time $ou #ave ta1en"as t#e *eriod 'or t#e oscillating

s$stem%

>' *endulum bob begin 'rom A

"ent to 8 "ent again to ) and

return to A3 0 times% #ere'ore

t#e time ta1en "as divided to 0

to get *eriod 'or t#e oscillation

s$stem%

7o"3 let sa$3 time ta1en 'or *endulum bob to oscillate 'rom

A to 8 and ) "as s% W#ic# i'

oscillate 'rom A to 8 and ) e/ual

Student 'ollo"s as "#at

#as been instructed%

uestion: W#at time $ou

#ave<

Student ans"er: 0 s

uestion: 8ased on t#e

/uestion and ans"er given3

"#at is *eriod de'inition<

Ans"er : .eriod is time

ta1en 'or t#e oscillating

s$stem to com*lete one

oscillation%

uestion: >' time ta1en 'or

*endulum bob to oscillate

'rom A-8-) is 2 s%

W#at is s$stem 're/uenc$<

Ans"er: M B& or 0%2 B&



iv% Wavelengt#

iv% "ave s*eed

H% S1etc# and

to a #al' o' one com*lete

oscillation% #ere'ore t#e

're/uenc$ 'or t#e s$stem "as N

6s or N B& or 0% B&%

Or i' "e 1no" t#e *eriod value3

3 t#ere'ore "e can calculate're/uenc$ b$ using relations#i* '

6%

in second%

8$ using trans*arenc$ teac#er

s#o" student Pcircular "ave@ and

?*lane "ave 'ront@ as *#otogra*#

above%

eac#er instruct student to *a$

attention on screen%

Teacher can a)s# sh#& P#&er

%#int %resentati#n 1A%%endi$

A2

Or b$ using ' 6%

2 + 2

4 s

' M

0%2 B&

uestion: 8ased on our

discussion3 "#at is

're/uenc$<

Ans"er : 're/uenc$ is a

number o' com*lete "ave

generated in a second%

eac#er uestion: 8asedon t#e *#otogra*#3 can $outell or s#o" us 'rom "#ere

to "#ere t#e "avelengt# is

measured%

Student ans"er: Student

"ent to in 'ront o' class!

From crest to ne+t crest

and measured in straig#t

line%

5 'Q



inter*ret a

dis*lacement-

time gra*# 'or a

"ave%

% S1etc# and

inter*ret adis*lacement-

distance gra*#

'or a "ave%

I% )lari'$ t#e

relations#i*

bet"een s*eed3

"avelengt# and

're/uenc$%

0% Solve

*roblemsinvolving s*eed3"avelengt# and

're/uenc$%

% Describe

dam*ing in an

oscillating

s$stem%

2% Describe

resonance in an

oscillating

s$stem%

E'ALUATION -

Teacher instr!ct the st!dents

t# d# the a)%ha(et

s#!%1A%%endi$ +2 and

cr#ss&#rd %!::)e1a%%endi$ C2

A'ter t#is e+*lanation

students "ill com*lete a

"or1 s#eet A**endi+ 8!



Wave )#aracteristics )ross"ord

0

5 , 6

7

;

<

=

0>

00 05

0, 06

07 0; 0?

0< 0=

5>

50

55

Acr#ss

4% A series o' *ulses generated at regular time intervals in an elastic medium "ill *roduce a RRRRRRRR

% >' t#e *eriod o' a "ave is 2%0 s3 its 're/uenc$ is RRRRB&

G% A *ulse traveling in a s*ringRRRRRR%energ$%

H% As t#e am*litude o' a "ave increases3 t#e energ$ trans*orted b$ t#e "aveRRRR

I% W#ic# *oint on a "ave is 0 degrees out o' *#ase "it# a "ave crest<2% "o "aves #ave t#e same 're/uenc$% W#ic# "ave c#aracteristics must also be identical 'or bot# "aves<

(% W#at is t#e 're/uenc$ o' a "ave "it# a *eriod o' 0%00 s<%%%%%%%%%%B&

% A single vibrator$ disturbance "#ic# moves 'rom *oint to *oint in a material medium is 1no"n as aRRRRR%%

H% #e s*eed o' a "ave de*ends on t#e *ro*erties o' t#e RRR%%and t#e nature o' t#e "ave%

% #e *eriod o' a "ave is t#e time it ta1es to com*lete oneRRR%



20% Wave motion on a medium trans'erRRRRenerg$%

2% #is "ave *#enomena is created "#en t"o "aves3 "it# t#e same 're/uenc$ and am*litude move in o**osite directions in t#e same medium%

22% )rest to crest ma1esRRRR

D#&n

% )rest to t#roug# overla* ma1esRRRRR%%2% Longitudinal "aves are involved in t#e transmission o' RRRRR%

(% As t#e 're/uenc$ o' a "ave increases3 t#e *eriod o' t#at "aveRRRR

% #e ma+imum dis*lacement o' a *article 'rom its rest *osition due to "ave motion is called RRR%%

0% #e RRRR%% is t#e number o' com*lete "aves *assing a given *oint in a second%% >' t#e 're/uenc$ o' a sound "ave remains constant3 its RRR%can be varied b$ c#anging am*litude%

4% Fre/uenc$ is measured inRRRRRR

G A RRRRR%%*ulse is a single vibrator$ disturbance%

I% An o*era singer can brea1 a glass "it# #er voices because t#e 're/uenc$ o' t#e note and natural vibration 're/uenc$ o' t#e glass areRRRRR



A%%endi$ +

A)%ha(et s#!%

Bo" man$ "ords t#at relate to t#e "aves do $ou 1no"< W#en $ou unscambled t#ese letters3 t#e$ s*ell several "aves-related "ords%

%=ou need a *encil and a *a*er%

Bere are t#e H4 al*#abets 6 letters

9 . 9 K >

K A 9 9 K

L O 5 F 7 > 59 A O O > >

W S > 5 . O

A A 7 7 B D

L A 7 8 O S 7

U U A > 7

> 9 L D K 7F K . K

L ) A =



2% #e c#allenge is to unscramble t#e letters to ma1e "aves-related "ords% =ou can unscamble t#e letters using a single s#eet o' *a*er and a *encil3

but it ma$ be easier i' $ou "rite eac# o' t#e letters on a se*arate sli*s o' *a*er and t#en arrange t#e sli*s o' *a*er% Or $ou can cut u* all t#e *ieces and

arrange t#em on t#e given *iece o' *a*er%

(% =ou must use all H4 t#e letters%

4% )an $ou 'ind all t#e "aves-related "ords< Do $ou 1no" "#at eac# "ord means<



Al*#abet sou*%

%

2%

(%

4%

%

G%

H%

%



Ans"er 'or al*#abet sou*

.9O.AA>O7

WA5KF9O7

L>B

A.L>UDK

5>89A>O7



A**endi+ )

WO9,SBKK:

>nstructions: )om*lete t#e labels in t#e diagram b$ *utting in t#e correct "ords% A.L>UDK3 K.OB!

dis*lacement

ime



Bo" do $ou 'ind t#e 4re@!enc* o' t#is "ave<

dis*lacement

distance

t 0

t M

distance

ar1 6 label t#e "avelengt# on t#e gra*#

Write a 'ormula to s#o" t#e relations#i* bet"een s*eed3 "avelengt# and 're/uenc$<

Solve t#e 'ollo"ing *roblem:

%)alculate t#e am*litude3 're/uenc$ and "avelengt# i' t#e s*eed o' t#e "ave is

cms-

4

( sec

4

WAVE (Understanding Wave)

Documents

Transcript of WAVE (Understanding Wave)