CIE iGCSE Co-Ordinated Science P5.2.2 The three types of nuclear emission Exam Style Questions Paper 3
Question
(a) α-particles, β-particles and γ-rays are all used in hospitals to treat cancer.
Table 6.1 gives information about the nature and charge of these three radiations.
(i) Complete Table 6.1.
(ii) Place the three radiations in order of their ionising ability, from most ionising to least ionising.
(iii) State which radiation is the most penetrating.
(b) X-rays and ultrasound waves are also used in hospitals.
(i) State one use of X-rays in hospitals.
(ii) Ultrasound waves have a frequency that is too high for a human to hear.
Use your knowledge of the range of audible frequencies for a human to suggest the frequency of ultrasound waves.
(c) A doctor in the hospital uses some sanitising hand liquid. The liquid contains ethanol, which evaporates from the skin of the doctor and cools the doctor’s hands.
Explain why the evaporation of the ethanol causes the doctor’s skin to cool.
Use ideas about molecules in your answer.
▶️Answer/Explanation
Ans : 6(a)(i)
;;;
one mark for each correct row
6(a)(ii) (in order)
$\alpha$ (-particles)
β (-particles)
$\gamma$ (-rays);
6(a)(iii) $\gamma$ -rays ;
6(b)(i) scanning / imaging (tissues) inside the body ;
6(b)(ii) any value above 20 000 (Hz) ;
6(c) most energetic molecules escape ;
from surface of liquid ;
lowering the temperature of the remaining ethanol molecules ;