AQAlAlLEVELlJUNEl2025lPHYSICSl7408/1
PAPERl1lQP
, 2
Dolnotlwritel
outsidelthelb
SectionlA ox
Answerlalllquestionslinlthislsection.
0lll 1llllllllllll Thislquestionlislaboutlanlisotopelofltitaniumlthatlonlyldecayslbylelectronlcapture.
0lll 1ll.ll 1lllll CompletelFigurel1ltolshowlthelquarklchangelthatloccurslduringlelectronlcapture.
Labellthelincominglandloutgoinglparticleslandlthelexchangelparticle.
[3lmarks]
Figurel1
0lll 1ll.ll 2lllll Inlsomelcircumstances,lalnucleusloflthislisotopelcanlexistlwithlnolorbitinglelectrons.
Explainlwhylalneutrallatomloflthislisotopelisllesslstablelthanlalnucleuslthatlhaslnolor
bitinglelectrons.
[1lmark]
, 3
Dolnotlwritel
outsidelthelb
0 ox
1ll .ll 3lllll Alnucleusloflthislisotopelofltitaniumlhaslalprotonlnumberlofl22landlalspecificl
chargelofl4.8l×l107l Clkg−1.
Determinelthelnumberloflneutronslinlthislnucleus.
[2lmarks]
numberloflneutronsl=lllllllllllllllllllllllllllllllllllllllllllllllllllllllll6
Turnloverlforlthelnextlquestion
Turnloverl►
PAPERl1lQP
, 2
Dolnotlwritel
outsidelthelb
SectionlA ox
Answerlalllquestionslinlthislsection.
0lll 1llllllllllll Thislquestionlislaboutlanlisotopelofltitaniumlthatlonlyldecayslbylelectronlcapture.
0lll 1ll.ll 1lllll CompletelFigurel1ltolshowlthelquarklchangelthatloccurslduringlelectronlcapture.
Labellthelincominglandloutgoinglparticleslandlthelexchangelparticle.
[3lmarks]
Figurel1
0lll 1ll.ll 2lllll Inlsomelcircumstances,lalnucleusloflthislisotopelcanlexistlwithlnolorbitinglelectrons.
Explainlwhylalneutrallatomloflthislisotopelisllesslstablelthanlalnucleuslthatlhaslnolor
bitinglelectrons.
[1lmark]
, 3
Dolnotlwritel
outsidelthelb
0 ox
1ll .ll 3lllll Alnucleusloflthislisotopelofltitaniumlhaslalprotonlnumberlofl22landlalspecificl
chargelofl4.8l×l107l Clkg−1.
Determinelthelnumberloflneutronslinlthislnucleus.
[2lmarks]
numberloflneutronsl=lllllllllllllllllllllllllllllllllllllllllllllllllllllllll6
Turnloverlforlthelnextlquestion
Turnloverl►