AQA AS Physics Paper 1 7407/1 | Marking Scheme 2025

Pleasebwritebclearlybinbblockbcapitals.

Centrebnumber Candidatebnumber


Surname b




Forename(s) b




Candidatebsignature

I declare this is my own work.

AS
PHYSICS
Paper 1 b




Wednesday 14 May 2025
b b b Morning Time allowed: 1 hour 30 minutes
b b b b b



Materials
Forbthisbpaperbyoubmustbhave: ForbExaminer’sbUse
 abpencilbandbabruler
Question Mark
 abscientificbcalculator
 abDatabandbFormulaebBooklet 1
 abprotractor. 2
3
Instructions
 Usebblackbinkborbblackbball-pointbpen. 4
 Fillbinbthebboxesbatbthebtopbofbthisbpage. 5
 Answerballbquestions. 6
 Youbmustbanswerbthebquestionsbinbthebspacesbprovided.b Dobnotbwriteb
7
outsidebthebboxbaroundbeachbpageborbonbblankbpages.
 Ifbyoubneedbextrabspacebforbyourbanswer(s),busebtheblinedbpagesbatbthebendbofbt TOTAL
hisbbook.b Writebthebquestionbnumberbagainstbyourbanswer(s).
 Doballbroughbworkbinbthisbbook.b Crossbthroughbanybworkbyoubdobnotbwantbt
obbebmarked.
 Showballbyourbworking.

Information
 Thebmarksbforbquestionsbarebshownbinbbrackets.
 Thebmaximumbmarkbforbthisbpaperbisb70.
 Youbarebexpectedbtobusebabscientificbcalculatorbwherebappropriate.
 AbDatabandbFormulaebBookletbisbprovidedbasbabloosebinsert.




IB/M/Jun25/G4003/V3 7407/1

, 2
Dobnotbwrit
eb outsidebt
Answerballbquestionsbinbthebspacesbprovided. he box




0 1 Hydrogenbhasbthreebnaturallyboccurringbisotopes.b Onebofbthesebisotopesbisb
b



 
hydrogen-3b 13H .


0 1 . 1 Calculatebthebspecificbchargebofbabnucleusbofbhydrogen-3.
[2bmarks]




specificbchargeb= ________________________ Cbkg−1


0 1 . 2 Thebspecificbchargebofbthebhydrogen-
3bnucleusbisblessbthanbthebspecificbchargesbofbthebnucleibofbthebotherbtwobisotopes.

Suggestbwhy.
[2bmarks]




IB/M/Jun25/7407/1

, 3
Dobnotbwrit
eb outsidebt
Kaonsb(K)bandbpionsb(π)barebproducedbwhenbabbeambofbantiprotonsbisbincidentbonbab he box

samplebofbhydrogenbgas.

Onebreactionbthatboccursbis

pb b b p b Kb  πb b K0

0 1 . 3 Deduce,bwithbreferencebtobappropriatebconservationblaws,bthebquarkbstructurebofbthe
K0bproducedbinbthisbreaction.
[3bmarks]




quarkbstructureb=b


0 1 . 4 Onebpossiblebdecaybofbabπ+bparticlebis

π+b b Ab+bB

wherebAbisbabchargedblepton.

Suggest,bwithbreferencebtobappropriatebconservationblaws,bthebnamebofbAbandbthebnam
ebofbB.
[2bmarks]




namebofbAb

namebofbBb 9




Turnboverb►


IB/M/Jun25/7407/1

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Dobnotbwrit
eb outsidebt
0 2 Anbopticalbfibrebconsistsbofbabglassbcorebsurroundedbbybcladding.bMon he box



ochromaticblightbentersbthebglassbcorebofbthebopticalbfibrebfrombair.

0 2 . 1 Whatbhappensbtobthebfrequencybofbtheblightbasbitbentersbthebglassbcore?b

Tickb()bonebbox.
[1bmark]


Itbdecreases.


Itbisbunchanged.


Itbincreases.




Thebrefractivebindexbofbthebglassbcorebisb1.51


0 2 . 2 Thebcriticalbanglebatbthebcore–claddingbboundarybisb80.7°

Calculatebthebrefractivebindexbofbthebcladding.
[2bmarks]




refractivebindexbofbcladdingb=b




IB/M/Jun25/7407/1