Angles of Refraction in Varieties of Densities

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    Name: Diva Aderly Grade/Secton: 10C Dae: 2 November 2017 SCIENCE INVESTIGATION Summatve Assessmen Angle of Refracton n Varetes of Denstes IN! IRING I# $ro%lem /Researc& !ueston '(#) How does the density of the medium or material aect the increase or decrease of the angle of refracon! IV# *+,o&ess '(#) f the material or medium is denser# then the angle of refracon will decrease# showing a more $rominent cut orturns in the light# due to the s$eed of light decreasing or the light having shorter wavelengths when $assing throughdenser mediums% $ROCESSING '$OST -A() VII# Collectng and $rocessng Daa 'C#) &he data was collected using a data table that shows the dierent mediums# their densies# and the three trials#along with the average 'mean( derived from the three trials% Daa Ta%le 'Colleced durng &e e.,ermen self)edumsDenstes 'g/cm 0 )Tral 1 '2)Tral 3 '2)Tral 0 '2)Average Water  1 g)cm * 1+,1-,1-,1-%**, Cooking Oil  0%.* g)cm * 1/,1/,17,17%+7, Isopropyl Alcohol  0%7/+ g)cm * *0,2/,2/,2/%+7, Dish Soap 1%0* g)cm * 0,0,0,0, Ethanol  0%7/. g)cm * 27,2-,27,2+%**, n order to show the data in a more re$resentable and clear form# the results have been interchanged to showthe mediums in a way where the least dense liuid medium comes rst# connuing to the densest% &he results of theangle of refracon for each medium corres$ond to the densies of each medium% eeing it $laced in order will allow usto easily see how the densies aect the increase and decrease of each angle of refracon% n addion to this# the datawill include the median# mode# and range for the data of each of the liuid mediums for more informaon and availabledata to clearly analy3e%   enar Inerculural Sc&ool Science Invesgaon – Grade 10 4iddle 5ears 6rogram   Creron C: $rocessng and Evaluatng   ) /      n these $ictures# the $rocess of how we e8ecuted the e8$eriment is shown% &he rst two $ictures shows usmeasuring the angles of the laser $ointer of two of the dierent mediums in the e8$eriment 'water and dish soa$(% &hethird $hoto shows us calculang for the mean 'average( and the collecng and short analy3ing of the data collected of the trials throughout the e8$eriment% Resul Ta%le 'In Order from -eas Dense o Denses 4 ean5 edan5 ode5 Range)edumsDenstes'g/cm 0 )Tral 1 '2)Tral 3 '2)Tral 0 '2)eanedanodeRange Isopropyl  Alcohol  0%7/+g)cm * *0,2/,2/,2/%+72/2/2 Ethanol  0%7/.g)cm * 27,2-,27,2+%**27272 CookingOil  0%.*,1/,1/,17,17%+71/1/1 Water  1 g)cm * 1+,1-,1-,1-%**1-1-1 Dish Soap 1%0* g)cm * 0,0,0,0000&he e8$eriment and $re9lab we chose for our grou$ e8$eriment was my $re9lab% t revolved around angles of refracon being tested and com$ared in dierent liuids with dierent densies to see if the light waves actually$rominently slow down in thic:er and denser liuid mediums 'such that of dish soa$(% ;e have learnt a lot about lightwaves and how they travel at dierent s$eeds in $hysics class and my grou$ mates and actually chose this e8$erimentbecause it was the most convenient that could be uic:ly done in a classroom# as some of the e8$eriments made by mygrou$ mates either reuired more com$licated materials or an inconvenient environment such as the $ool%Having only an hour to com$lete the e8$eriment in class# we decided to <ust go with my $re9lab as the materialsare available in the lab and are easier to nd% &he only material that we brought by ourselves was the coo:ing oil as wehave reuested the rest of the materials from the lab and they were available% Actually# before eding and chancing the$re9lab# instead of ethanol# we were loo:ing for lam$ oil but it wasn=t available in the lab so we com$romised% t was sllas valuable as the density of ethanol didn=t match any of the density of the other liuid mediums% t came close withiso$ro$yl alcohol but their densies sll dier by 0%00* g)cm * %  VIII# Iner,retng Daa and Resuls 'C#) All the ve dierent liuid mediums are all dierent in densies% n order from least dense to most dense# the listgoes> so$ro$yl alcohol# ethanol# coo:ing oil# water# then lastly the densest# dish soa$% ?or each water medium# thedegrees of the angle of refracon only vary by 1, or 2, $er trial or by none at all 'dish soa$(# resulng to a generally$re@y consistent result% &he results were actually <ust as what was e8$ected and the general data collected of the angleof refecon varies and connects directly to the density of the liuid mediums% &he hy$othesis of this e8$eriment was> f the material or medium is denser# then the angle of refracon will decrease# showing a more $rominent cut or turn inthe light# due to the s$eed of light decreasing or the light having shorter wavelengths when $assing through densermediums%B?rom the said hy$othesis# it has been $roven that the denser the medium the laser has to $ass through the lessthe angle of refracon# so the less dense the medium is# the larger the angle of refracon is% &his is caused by thedecrease in the s$eed of light when $assing through the denser mediums% &he inde$endent variable of the e8$erimentwas the dierent liuid mediums and its varying densies while the de$endent variable would be the measured angle of refracon% &he $redicted answer of the e8$eriment is that the denser the liuid mediums are the lesser the angle of refracon# creang a bigger bend in the liuid itself% &he result of the e8$eriment shows that the denser mediums have a decreased angle of refracon and a larger#more $rominent bend while the less dense mediums have a larger angle of refracon and with a less visible# less$rominent bend of the light% &he results are> so$ro$yl alcohol  2/%+7,# ethanol  2+%**,# coo:ing oil  17%+7,# water 1-%**,# and lastly dish soa$  0, 'the light of the laser $ointer only touched the surface of the dish soa$# not $assingthrough a single bit(% o as we can see easily# the denser mediums li:e water have an angle of 1-%**,# showing a more$rominent bend com$ared to iso$ro$yl alcohol that has an angle of refracon of 2/%+7,Eeferring bac: to the bac:ground informaon and our $rior :nowledge to this to$ic# we :now that light travels ina straight line but can be bended when $assing through dierent mediums with dierent densies% &he bend of the lightis due to the slowing down $rocess of the light along with the shortening of its wavelengths# causing the light to benddown more in a denser medium% &his is also the cause of $ers$ecve form water and air% ;hen we see an ob<ect in thewater# we might not see it in the $lace of where its e8actly located# it may be slightly further loo:ing than it actually is%&his conce$t and reality is a result of the angle of refracon and the slowing down of the s$eed of light when goingtowards the water coming from the air above% o with that being said# the variables connect and aect each other heavily as shown in the result of thee8$eriment% &he de$endent variable# the angle of refracon# is aected and is concluded from the inde$endent variable#the dierent liuid mediums and its densies% &he second table above shows the results in an ascending order from theleast dense liuid medium# iso$ro$yl alcohol# to the most dense# liuid dish soa$% ;hen we loo: at the mean 'average(angle of refracon# we see it decrease as we go down the table because the lower we g# the denser the liuid medium#meaning the lesser the angle of refracon 'a more $rominent bend(% ;ith that# it is safe to say that the e8$eriment andits data collected has $roven easily that the hy$othesis  f the material or medium is denser# then the angle of refraconwill decrease# showing a more $rominent cut or turn in the light# due to the s$eed of light decreasing or the light havingshorter wavelengths when $assing through denser mediums%B s correct% EVA- ATING I6# Concluson 'C# and C#v) Fverall# the whole e8$eriment was uite successful and generally not e8tremely as hard as we inially e8$ected%6rior to actually conducng the e8$eriment# we as a grou$ read the $re9lab together and thought it would be uite easy%Gut it turns out# by the me we received our materials from the lab to iniate the e8$eriment# we tested the laser  $ointed at the surface of the water and it turns out that it was barely visible to the eye% ?rom that moment# we actuallydoubted the e8$eriment as a whole# regreng that we chose this s$ecic one involving barely9even9visible laser$ointers% Gut we decided to <ust do our best and it turns out that by wor:ing together# we can achieve the end of thee8$eriment nicely% n the beginning# one of our members tried to test the laser in the water but it was hard s he had to multas:# soby doing it as a team# we managed to Iy by the collecng of data in the e8$eriment uite uic:ly and reliably% Fne of usheld the $rotractor against the surface of the liuid medium# another $ointed the laser at the surface of the liuidmedium at an angle of J-,# while another made sure that the mar:s were visible and the bea:er wouldn=t move whilethe angle of refracon is being measured% ;e collected the data and analy3ed each of them uite uic:ly together# alongwith the com$aring of the result of each liuid mediums angle of refracon with their res$ecve densies%Koo:ing at the data collected# the answers seem to easily and obviously su$$ort the given hy$othesis at thebeginning of the e8$eriment% &he hy$othesis was> f the material or medium is denser# then the angle of refracon will decrease# showing a more $rominent cut or turnsin the light# due to the s$eed of light decreasing or the light having shorter wavelengths when $assing through densermediums%BKoo:ing bac: at the data# in order from the least dense to the densest# the list goes as> so$ro$yl alcohol#ethanol# coo:ing oil# water# then lastly the most dense of the ve# liuid dish soa$% &he result for each of the averageangle of refracon is> so$ro$yl alcohol  2/%+7,# ethanol  2+%**,# coo:ing oil  17%+7,# water  1-%**,# and lastly dishsoa$  0, 'the light of the laser $ointer only touched the surface of the dish soa$# not $assing through a single bit(% As theliuids get denser# the angle of refracon is shown to decrease# creang a more $rominent bend from the laser starngfrom the $oint where it touches the surface of the liuid to the $oint where it touches the base of the bea:er aLer$assing through the liuid in a certain angle of refracon%o as an e8am$le# if were to com$are iso$ro$yl alcohol with water# the bend of the light is more $rominentwhen in water com$ared to iso$ro$yl alcohol# water having an angle of refracon of 1-%**, measured from the normalvercal line while iso$ro$yl alcohol having an angle of refracon of 2/%+7, measured from the normal vercal line% o thesmaller the angle of refracon# the greater bend you will be able to see from the light of the laser $ointer% &he results of the e8$eriment easily shows that the denser the liuid mediums the light of the laser $ointer has to $as through# thelarger the bend meaning the less the angle of refracon due to the slowing down of the light and the shortening of itswavelengths% ;ith this being said# can trusMully say that the hy$othesis of this e8$eriment has been $roven to becorrect and reliable%
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