TEACHING AND LEARNING MODULES FOR PHYSICS Form 4 Semester 2 Duration 40 minutes Learning Area Waves Learning Objectives Understanding Waves Learning Outcomes A student is able to :- ! descr ibe "#at is meant b $ "ave motio n% 2! reco gni&e t#at "av es trans' er energ$ "it#out trans'er matter(! )om*a re transve rse and longit udinal "ave s and give e+am*les eac #% 4! ,no" t#e de 'inition o' "ave 'ront s% ! State t# e direct ion o' *ro*aga tion o' "ave s in relatio n to "ave'ro nts .r e- re /uisit e: ,no"le dge S1il l #e conce*ts o' di stance3 veloci t$3 t ime3 and ener g$ aterial L)D3)om*uter and slin1$ tan1% .e dagog$: Str ategie s e c#ni /ues Demonst ra ti on and c ons tr uc ti vi sm Language Focus 5ocabular$ and science *rocess "ords3 'unction "ords Sc ie nt i 'i c an d6 or 7o bl e 5a lu e 8e ing coo *e rative3 s$st e ma t ic and inde*e nd ent 9e'lection
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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 $uick to respond have them hold hands and close
! compression is characteri'ed by having a particle in the medium moveforward& bump into the next particle in the medium and then bounce back toits original position. This continues with each particle bumping its neighborand then returning to its original position thereby transmitting thedisturbance through the medium.
Materials
! group of people seated side by side and shoulder to shoulder in a row.+eople sitting on a bench (long chair) placed next to each other are in thecorrect orientation for this demonstration.
Instructions
1. #nstruct a person on one side of the room to bend and gently bumpshoulders with their neighbor and return to their normal position.
2. The person bumped responds by bending to bump shoulders with thethird person in line and so on.
4% A series o' *ulses generated at regular time intervals in an elastic medium "ill *roduce a RRRRRRRR
% >' t#e *eriod o' a "ave is 2%0 s3 its 're/uenc$ 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%
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
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<