Skip to content

Course home

Sign up

5.2 Radioactivity

EasyMedium
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356
Question 151

A nucleus of uranium-238 (92238U^{238}_{92}\text{U}92238​U) emits an α\alphaα-particle to form a nucleus of thorium (Th\text{Th}Th).

Which equation represents this decay?

A

92238U→ 94242Th+ 24α^{238}_{92}\text{U} \rightarrow \ ^{242}_{94}\text{Th} + \ ^{4}_{2}\alpha92238​U→ 94242​Th+ 24​α

B

92238U→ 93238Th+ −10β−^{238}_{92}\text{U} \rightarrow \ ^{238}_{93}\text{Th} + \ ^{0}_{-1}\beta^{-}92238​U→ 93238​Th+ −10​β−

C

92238U→ 91238Th+ 10β+^{238}_{92}\text{U} \rightarrow \ ^{238}_{91}\text{Th} + \ ^{0}_{1}\beta^{+}92238​U→ 91238​Th+ 10​β+

D

92238U→ 90234Th+ 24α^{238}_{92}\text{U} \rightarrow \ ^{234}_{90}\text{Th} + \ ^{4}_{2}\alpha92238​U→ 90234​Th+ 24​α

Markscheme

5.2 Radioactivity Questions

  1. IGCSE
  2. /Physics
  3. /5.2 Radioactivity

484 exam-style questions on CIE IGCSE Physics 5.2 Radioactivity, covering 5.2.1 Background radiation and measuring count rate, 5.2.2a Alpha, beta and gamma emission, 5.2.2b Deflection and ionising effects of nuclear radiation, 5.2.3a Radioactive decay, 5.2.3b Effects of decay on the nucleus and decay equations, 5.2.4a Half-life, 5.2.4b Choosing isotopes for applications, and 5.2.5 Effects of ionising radiation and safety precautions. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank