lesson 1-f5 physics

8/18/2019 Lesson 1-F5 Physics

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Name : Teacher: Cheng Wui Leap

Subject : SPM Physics Class : F5 Physics

Chapter

:

Waves Lesson No :

!ate :Topic : " #n$erstan$ing Waves Time :

Scheme of Assessment

PAPER TYPE DURATION MARKS

MC% &5'%s( hr 5 minutes 5'

) Section * &+ %s(,-'m.

Section / &01'(&choose (&)'m(

Section C&1 )(&Choose (&)'m(

) hr 2' minuts ''

2 Section * & )%s( &)+ m(

Section /&213( &Choose ( &)m(

hr 2' minutes 3'

Form 5

Chapter Topic

Waves " #n$erstan$ing Waves

") *nalysing 4election o Waves

"2 *nalysing 4eraction o Waves

"3 *nalysing !iraction o Waves

"5 *nalysing 6ntererence o Waves

"- *nalysing Soun$ Waves

"7 *nalysing 8lectromagnetic Waves

8lectricity )" *nalysing 8lectric Fiel$s an$ Charge Flo9

)") *nalysing the 4elationship bet9een 8lectric Current

an$ Potential !ierence

)"2 *nalysing Series an$ Parallel Circuits

)"3 *nalysing 8lectromotive Force an$ 6nternal 4esistance

)"5 *nalysing 8lectrical 8nergy an$ Po9er

8lectromagnetism 2" *nalysing the 8ect o a Currentcarrying Con$uctor

2") #n$erstan$ing the Force on a CurrentcarryingCon$uctor in a Magnetic Fiel$

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2"2 *nalysing8lectromagnetic6n$uction

2"3 *nalysing Transormers

2"5 #n$erstan$ing the ;eneration an$ Transmission o

8lectricity

8lectronics 3" #n$erstan$ing the #ses o the Catho$e4ay


3/15

)" *n oscillating or vibrating system acts as the source o 9aves 9hich transer ener#' f rom one point

to another ,9ithout transerring mass."

2" 8>amples o 9aves:

,a. (i#ht 9aves are pro$uce$ as a result o vibrations o electrons in an atom"

,b. So)n" 9aves are pro$uce$ by vibrating mechanical bo$ies such as guitar strings

or a tuning or=",c. $ater &a%es are pro$uce$ by a $isturbance ,or vibration. on a still 9ater surace"

Propa#ation *Tra%e++in#, of $a%es

" When a 9ave travels through a me$ium1 the particles o the me$ium vibrate about their

e-)i+i.ri)m positions"

)" ?o9ever1 the particles o the me$ium "o not travel in the $irection o the 9ave"

2" * 9ave transfers energy an$ the momentum rom the so)rce o the 9ave ,the oscillating or

vibrating system. to the s)rro)n"in#s"

*ctivity

To To "emonstrate that &a%es transfer ener#' &itho)t transferrin# matter

*pparatus@ Materials 4a$io1 can$le an$ matches"

Proce")re

" * can$le is place$ about ' cm rom the spea=er o a ra$io"

)" The can$le is lit an$ the movements o its lame is observe$"

2" Then1 the ra$io is turne$ on an$ the volume o the soun$ is gra$ually increase$ until a change in the

movement o the lame becomes noticeable"

Disc)ssion

The lame %i.rates 9hen the ra$io is turne$ on" This observation sho9s that the propagation o the soun$

9aves rom the vibration o the cone o the spea=er transers ener#' ,or momentum. to the lame an$

causes it to %i.rate"

Conc+)sion

Waves transer energy rom a vibrating system &itho)t transerring matter"

The total energy carrie$ by a 9ave $epen$s on its amp+it)"e an$ fre-)enc'" * 9ave 9ith a large amplitu$e

or a high reAuency carries a +ar#er amount o energy"

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$a%efronts in Re+ation to the Direction of Propa#ation of $a%es

" * &a%efront is a line or plane on 9hich the vibrations o every points on it are in phase an$ are at

the same $istance rom the source o the 9ave"

)" Points in a 9ave are in phase i they vibrate in the same $irection 9ith the same $isplacement"

P+ane $a%efronts

" Figure "3 sho9s the pro$uction o plane 9ater 9aves 9hen a 9oo$en bar vibrates vertically at a

constant reAuency on the surace o the 9ater

)" Lines P%1 4S1 T# an$ BW are straight lines along the respective crests o the 9aves" These lines

are calle$ &a%efronts"

2" Figure "5 sho9s that the 9averonts are per pen"ic)+ar to the $irection o propagation"

Circ)+ar $a%efronts

" When 9e use a ingertip to touch the surace o 9ater repeate"+'1 circular 9averonts are pro$uce$

as sho9n in Figure "-"

/! The 9averont at any point is perpen"ic)+ar to the $irection in 9hich the 9ave is a$vancing

T'pes of $a%es

There are t9o types o 9aves"

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5/15

,a. Transverse 9ave

,b. Longitu$inal 9ave

Trans%erse $a%es

" * transverse 9ave is a 9ave in 9hich the vibration o particles in the me$ium is at ri#ht an#+e

,perpen$icular. to the $irection o propagation o the 9ave"

/! 8>amples o transverse 9aves are &ater &a%es an" +i#ht &a%es"

(on#it)"ina+ $a%es

" * longitu$inal 9ave is a 9ave in 9hich the vibration o particles in the me$ium is para++e+ to the

$irection o propagation o the 9ave"

)" 8>ample o longitu$inal 9aves are so)n" &a%es"

E0ercise

" &SPM'-@%2(!iagram + sho9s the cross section o 9ater 9aves"

Which o the ollo9ing statements is true about the 9ater 9avesD

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* T an$ # have the same phase

/ Wave energy is transerre$ rom position S to #

C The 9avelength is the $istance bet9een S an$ #

! The particle at # oscillates in a $irection parallel to the $irection o the 9ave

propagation

)" &SPM'-@%25(!iagram )) sho9s t9o situations 9here a ball loats an$ moves on the surace o

the 9ater"

The $irection o the movement o the ball is

* parallel to the $irection o the 9ave propagation

/ perpen$icular to the $irection o the 9ave propagation

C the same as the $irection o the 9ave propagation

! the opposite to the $irection o the 9ave propagation

2" &SPM'0@%)0(Which $iagram sho9s the pro$uction o a longitu$inal 9aveD

3" &SPM'@%)5(Which $evice is use$ to sho9 that light is a transverse 9aveD

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7/15

* ;lass prism

/ !ouble slit

C !iraction grating

! Polaroi$ bloc

5" &SPM'7@P)@%(!iagram sho9s ho9 a vibrating tuning or= pro$uces soun$ 9aves in air"

,a. #n$erline the correct ans9er in the brac=et to complete the sentence belo9"

Soun$ 9ave is a ,longitu$inal1 transverse. 9ave"& mar=(

,b. /ase$ on !iagram 1

,i. name region E1 & mar=(

,ii. mar= one $istance 9hich is eAual to a 9avelength o the soun$ 9aves"

Label the $istance using the symbol *"& mar=(

,c. The tuning or= in !iagram vibrates in 9ater"

What happens to the spee$ o soun$D& mar=(

-" &SPM'+@P)@%(!iagram sho9s a slin=y spring being move$ let an$ right continuously"

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8/15

,a. Complete the sentence belo9 by tic=ing ,✓. the correct bo>"

,b.


9/15

3" From the ormulae o T an$ 1 the relationship bet9een perio$1 T an$ reAuency1 is:

T

f

=

T is in%erse+' proportional to an$ vice versa"

E0ercise

" * mass on a spring oscillates 9ith a reAuency o 3 ?G" What is the time ta=en by the mass to

complete )' oscillationsD

)" * mass on a spring oscillates 9ith a reAuency o 2 ?G" Calculate

,a. the number o oscillations in ' s1

,b. the perio$ o oscillation"

2" * 9ave o reAuency )3' ?G has a 9avelength o - m" What is the spee$ o the 9aveD

Disp+acement3time 4raph of a $a%e

From the graph o s against t in Figure "'1 the ollo9ing inormation is obtaine$"

,a. *mplitu$e1 * H a cm

,b. Perio$ o oscillation1 T is the time bet9een points:

,i. ' an$ F1 ,ii. C an$ ; or ,iii. P an$ %

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10/15

E0ercise

"

From the graph1

,a. state the amplitu$e1

,b. calculate the perio$ o the oscillation1

,c. calculate the reAuency o the oscillation"

Disp+acement3"istance 4raph of a $a%e

1. The 9avelength1

λ

is the $istance bet9een successive points o the same phase in a 9ave" For

e>ample:

(a) the $istance bet9een t9o successive crests or t9o successive troughs in a 9ater 9ave1

(b)the $istance bet9een t9o successive compressions or t9o successive rareactions in a soun$ 9ave"

2. The S6 unit o 9avelength1

λ

is metre ,m."

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11/15

E0ercise

"

Fin$

(a) the amplitu$e1

(b) the 9avelength o the 9ave"

)" The igure sho9s the orm o a transverse 9ave pro$uce$ by a slin=y soring"

What is

,a. its amplitu$eD

,b. its 9avelengthD

Re+ationship .et&een Spee" *%,1 $a%e+en#th *

λ

, an" fre-)enc' *f,

v f λ =

E0ercise

1. The $isplacement$istance graph in Figure "3 sho9s the motion o a transverse 9ave" The source

o the 9ave pro$uces ' complete 9aves in one secon$"

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12/15

Calculate

(a)the amplitu$e1 (b) the 9avelength1 an$ (c)the spee$ o the 9ave"

)" The igure belo9 is the $isplacementtime graph o a 9ave"

Calculate

,a. the amplitu$e1

,b. the reAuency1

,c. the 9avelength1i the spee$ o the 9ave is + cm s "

2" &SPM'7@%2'(!iagram 0 sho9s a loa$ being oscillate$ on a spring"/ase$ on !iagram 01 9hich

o the ollo9ing $isplacementtime graphs represents oscillation o the loa$ rom P to % an$ bac=

to 'D

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13/15

3" &SPM'+@%)0(!iagram 7 sho9s the $isplacement$istance graph o a 9ave" The reAuency o the

9ave is 5"' ?G"

What is the velocity o the 9aveD

* 5' cm s

/ 75 cm s

C '' cm s

! 5' cm s

5" &SPM'@%)+(!iagram )) sho9s a 9ave"

The spee$ o the 9ave is 3"' m s" The $istance o 5 consecutive crests is + m"

What is the reAuency o the 9aveD

* '"3 ?G / '"5 ?G

C )"' ?G ! )"5 ?G

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14/15

-" &SPM@%)0(!iagram )' sho9s soun$ 9aves pro$uce$ by a tuning or=" The velocity o the

soun$ in air is 23' ms"

What is the reAuency o the soun$ 9aveD "

* )'3"' ?G / )+2"2 ?G

C 23") ?G ! 3'+"' ?G

7" &SPM'5@%25(The graphs sho9 the crosssections o 9ater 9aves" Which 9ave has the greatest

energyD

+" &SPM'5@%2)(The $iagram sho9s a 9averont pattern pro$uce$ by a $ipper vibrating at areAuency o ) ?G in a ripple tan="

What is the spee$ o the 9avesD

* ) cm s

/ +cms

C ) cms

! + cms

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15/15

0" &SPM'7@%)0(!iagram + sho9s a 9ave pattern on 9ater"

Wavelength is the $istance bet9een the points

* P an$ % / P an$ 4

C % an$ S ! 4 an$ S

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lesson 1-f5 physics

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