Skip to content

Course home

Sign up

5.2 Radioactivity

EasyMedium
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128
Question 51

A radioactive material has a half-life of 15 days.

A sample of the material contains 1.6 × 1011 atoms.

How many atomic nuclei have decayed after 45 days?

A

2.0×10102.0 \times 10^{10}2.0×1010

B

8.0×10108.0 \times 10^{10}8.0×1010

C

1.2×10111.2 \times 10^{11}1.2×1011

D

1.4×10111.4 \times 10^{11}1.4×1011

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