10A5m - Graf Separuh hayat pereputan radioaktif

2.  Diagram 2.1 shows the rate of decay of radioactive substance, Iodine-131.
     Rajah 2.1 menunjukkan kadar pereputan bagi suatu bahan radioaktif, Iodin-131.

Diagram 2.1/Rajah 2.1

(a) What is meant by ‘half – life’?
Apakah yang dimaksudkan dengan ‘separuh hayat’?
………………………………………………………………………………………

[1 mark / 1 markah]

(b) Based on Diagram 2.1, what is the half – life of Iodine?
Berdasarkan Rajah 2.1 berapakah separuh hayat Iodine?
………………………………………………………………………………………

[1 mark / 1 markah]

(c) What happen to the activity of Iodine-131 after 24 days?
Apakah yang terjadi kepada aktiviti Iodine selepas 24 hari?
…….…………………………………………………………………………………

[1 mark / 1 markah]

(d) When Iodine-131 decays, it produces a beta particle and Xenon-131(Xe).
Apabila Iodine -131 mereput, Iodine menghasilkan zarah beta dan Xenon -131 (Xe)
(i) What is beta particle?
Apakah zarah beta?
………………………………………………………………………………

[1 mark / 1 markah]

(ii) Complete the following equation for the decay of Iodine-131.
Lengkapkan persamaan berikut untuk pereputan Iodine-131.

[1 mark / 1 markah]

Jawapan: 

2	a	The time taken for half of the unstable atoms to decay // The time taken for the activity of radioactive falls to half of its original activity.	1
	b	8 days	1
	c	The activity decreases to 250 count per minute.	1
	d(i)	Fast moving electron	1
	(ii)
TOTAL			5