Quelpr
2 marksHalf-life

CSEC Physics · May/June 2018 · Paper 2 · Question 2(b)(i)

Define the term 'half-life' of a radioactive substance.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 2(a)(i)Complete the following table to show the charge of EACH particle.[3 marks]
  2. 2(a)(ii)For the element 226/88 Ra, determine the number of EACH of the three particles referred to in (a)(i).[4 marks]
  3. 2(a)(iii)State ONE similarity and ONE difference between the isotopes of an element.[2 marks]
  4. 2(b)(ii)The element thorium (Th) has a half-life of 24 days and undergoes beta-decay. Calculate the time it would take for 10 grams of thorium to decay to 1.25 grams.[4 marks]

More practice: the rest of this paper · more Half-life questions · all CSEC Physics past papers