Page 229 - Physics Form 5 KSSM_Neat

Self-Reflection
Self-Reflection SCAN ME CHAPTER 6
SCAN ME
Download and print
1. New things that I have learnt from the chapter ‘Nuclear Self-Reflection Nuclear Physics
Physics’ are ✎ . http://bit.ly/3gi5xC

2. The most interesting thing that I have learnt in this chapter
KEMENTERIAN PENDIDIKAN MALAYSIA
is ✎ .
3. The things I still do not fully understand are ✎ .

4. My performance in this chapter.

Poor 1 2 3 4 5 Very good

5. I need to ✎ to improve my performance in this chapter.

Summative Practice

1. What is meant by: http://bit.
(a) radioactive decay ly/2D3VKVT
(b) half-life
(c) nuclear energy

2. The following shows the equation for a radioactive decay:

226 Ra Rn + X + Y
222
4

88 86 2
(a) Identify X and Y in the decay equation.
210
222
(b) How many a and b-particles will be released when Rn decays to Pb?
82
86
3. (a) Astatine-218 has a half-life of 1.6 s. How long will it take for 99% of the nucleus in one
sample of astatine-218 to disintegrate?
(b) Radium-226 has a half-life of 1 600 years. What percentage of the sample of
radium-226 will be left after 8 000 years?

219