Edexcel IGCSE - Radioactivity

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Edexcel iGCSE Physics book cover  Edexcel iGCSE Physics book cover

 

1. An atom of
14
C contains protons and neutrons.
6

How many?

 

 
number of neutrons
number of protons
A.
14
6
B.
8
6
C.
6
8
D.
6
14

 

2&3. Look at this diagram of an atom of a common element.

 

2. What is the atomic (proton) number?

A). 3
B). 4
C). 7
D). 10

3. What is the mass (nucleon) number?

A). 3
B). 4
C). 7
D). 10

 

4. Two isotopes of the same element have

A). the same number of protons but different numbers of neutrons.
B). the same number of protons but different numbers of electrons.
C). the same number of neutrons but different numbers of protons.
D). the same number of electrons but different numbers of protons.

5. A radioactive isotope is a substance that

A). will eventually gain electrons through bonding.
B). will become stable by cooling down.
C). is unstable and will ‘decay’ by losing particles.
D). is not found naturally on the Earth.

6. Which of the following best describes the words 'contamination' and 'irradiation'?

Contamination
irradiation
A.
The unwanted presence of radioactive isotopes
The exposure of an object to electromagnetic radiation
B.
The unwanted presence of radioactive isotopes
The exposure of an object to nuclear radiation
C.
The exposure of an object to electromagnetic radiation
The unwanted presence of radioactive isotopes
D.
The exposure of an object to nuclear radiation
The unwanted presence of radioactive isotopes

Questions 7-9 are about types of radiation.

Which type(s) of radiation match the following descriptions?

7. The most ionising.

8. A fast moving electron.
9. Can pass through paper.

 

10. When Uranium decays it emits an alpha particle, forming an isotope of Thorium. Which of the following decay equations is correct?

A.
238
U
232
Th
+
2
α
92
90
2
B.
238
U
236
Th
+
2
α
92
90
2
C.
238
U
234
Th
+
4
α
92
90
2
D.
238
U
232
Th
+
4

α

92
90
2
11. What change takes place to an atom during beta decay?

A). A proton changes into a neutron.
B). A proton changes into an electron.
C). An electron changes into a neutron.
D). A neutron changes into a proton.

12. In this decay equation, what are the missing numbers x and y?

 
24
Na
24
Mg
+
y

β

11
x
-1
  • A. x=10, y=1
  • B. x=10, y=0
  • C. x=12, y=1
  • D. x=12, y=0