A-level
Physics
7408/3BB-Paper 3 Section B – Medical Physics
n n n n n n
Mark scheme
n
Junen2018
Version/Stage:n1.0nFinal
, MARKnSCHEMEn–nA-LEVELnPHYSICSn–n7408/3BBn–nJUNEn2018
MarknschemesnarenpreparednbynthenLeadnAssessmentnWriternandnconsidered,ntogethernwithnthenrelevantn
questions,nbynanpanelnofnsubjectnteachers.nThisnmarknschemenincludesnanynamendmentsnmadenatnthensta
ndardisationneventsnwhichnallnassociatesnparticipateninnandnisnthenschemenwhichnwasnusednbynthemninnthisn
examination.nThenstandardisationnprocessnensuresnthatnthenmarknschemencoversnthenstudents’nresponse
sntonquestionsnandnthatneverynassociatenunderstandsnandnappliesnitninnthensamencorrectnway.
Asnpreparationnfornstandardisationneachnassociatenanalysesnannumbernofnstudents’nscripts.n Alternativenan
swersnnotnalreadyncoverednbynthenmarknschemenarendiscussednandnlegislatednfor.nIf,nafternthenstandardisa
tionnprocess,nassociatesnencounternunusualnanswersnwhichnhavennotnbeennraisedntheynarenrequiredntonref
ernthesentonthenLeadnAssessmentnWriter.
Itnmustnbenstressednthatnanmarknschemenisnanworkingndocument,ninnmanyncasesnfurtherndevelopednandne
xpandednonnthenbasisnofnstudents’nreactionsntonanparticularnpaper.nAssumptionsnaboutnfuturenmarknsche
mesnonnthenbasisnofnonenyear’sndocumentnshouldnbenavoided;nwhilstnthenguidingnprinciplesnofnassessme
ntnremainnconstant,ndetailsnwillnchange,ndependingnonnthencontentnofnanparticularnexaminationnpaper.
Furtherncopiesnofnthisnmarknschemenarenavailablenfromnaqa.org.uk
Copyrightn©n2018nAQAnandnitsnlicensors.n Allnrightsnreserved.
AQAnretainsnthencopyrightnonnallnitsnpublications.nHowever,nregisterednschools/collegesnfornAQAnarenpermittedntoncopynmaterialnfromnthisn
bookletnforntheirnownninternalnuse,nwithnthenfollowingnimportantnexception:nAQAncannotngivenpermissionntonschools/collegesntonphotocopyn
anynmaterialnthatnisnacknowledgedntonanthirdnpartynevennforninternalnusenwithinnthencentre.
Physics
7408/3BB-Paper 3 Section B – Medical Physics
n n n n n n
Mark scheme
n
Junen2018
Version/Stage:n1.0nFinal
, MARKnSCHEMEn–nA-LEVELnPHYSICSn–n7408/3BBn–nJUNEn2018
MarknschemesnarenpreparednbynthenLeadnAssessmentnWriternandnconsidered,ntogethernwithnthenrelevantn
questions,nbynanpanelnofnsubjectnteachers.nThisnmarknschemenincludesnanynamendmentsnmadenatnthensta
ndardisationneventsnwhichnallnassociatesnparticipateninnandnisnthenschemenwhichnwasnusednbynthemninnthisn
examination.nThenstandardisationnprocessnensuresnthatnthenmarknschemencoversnthenstudents’nresponse
sntonquestionsnandnthatneverynassociatenunderstandsnandnappliesnitninnthensamencorrectnway.
Asnpreparationnfornstandardisationneachnassociatenanalysesnannumbernofnstudents’nscripts.n Alternativenan
swersnnotnalreadyncoverednbynthenmarknschemenarendiscussednandnlegislatednfor.nIf,nafternthenstandardisa
tionnprocess,nassociatesnencounternunusualnanswersnwhichnhavennotnbeennraisedntheynarenrequiredntonref
ernthesentonthenLeadnAssessmentnWriter.
Itnmustnbenstressednthatnanmarknschemenisnanworkingndocument,ninnmanyncasesnfurtherndevelopednandne
xpandednonnthenbasisnofnstudents’nreactionsntonanparticularnpaper.nAssumptionsnaboutnfuturenmarknsche
mesnonnthenbasisnofnonenyear’sndocumentnshouldnbenavoided;nwhilstnthenguidingnprinciplesnofnassessme
ntnremainnconstant,ndetailsnwillnchange,ndependingnonnthencontentnofnanparticularnexaminationnpaper.
Furtherncopiesnofnthisnmarknschemenarenavailablenfromnaqa.org.uk
Copyrightn©n2018nAQAnandnitsnlicensors.n Allnrightsnreserved.
AQAnretainsnthencopyrightnonnallnitsnpublications.nHowever,nregisterednschools/collegesnfornAQAnarenpermittedntoncopynmaterialnfromnthisn
bookletnforntheirnownninternalnuse,nwithnthenfollowingnimportantnexception:nAQAncannotngivenpermissionntonschools/collegesntonphotocopyn
anynmaterialnthatnisnacknowledgedntonanthirdnpartynevennforninternalnusenwithinnthencentre.
