1. Motion, forces and energy

1.1 Physical quantities and measurement techniques

1.2 Motion

1.3 Mass and weight

1.4 Density

1.5.1 Effects of forces

1.5.2 Turning effect of forces

1.5.3 Centre of gravity

1.6 Momentum

1.7.1 Energy

1.7.2 Work

1.7.3 Energy resources

1.7.4 Power

1.8 Pressure

2. Thermal physics

2.1.1 States of matter

2.1.2 Particle model

2.1.3 Gases and the absolute scale of temperature

2.2.1 Thermal expansion of solids, liquids and gases

2.2.2 Specific heat capacity

2.2.3 Melting, boiling and evaporation

2.3.1 Conduction

2.3.2 Convection

2.3.3 Radiation

2.3.4 Consequences of thermal energy transfer

3. Waves

3.1 General properties of waves

3.2.1 Reflection of light

3.2.2 Refraction of light

3.2.3 Thin lenses

3.2.4 Dispersion of light

3.3 Electromagnetic spectrum

3.4 Sound

4. Electricity and magnetism

4.1 Simple phenomena of magnetism

4.2.1 Electric charge

4.2.2 Electric current

4.2.3 Electromotive force and potential difference

4.2.4 Resistance

4.2.5 Electrical energy and electrical power

4.3.1 Circuit diagrams and circuit components

4.3.2 Series and parallel circuits

4.3.3 Action and use of circuit components

4.4 Electrical safety

4.5.1 Electromagnetic induction

4.5.2 The a.c. generator

4.5.3 Magnetic effect of a current

4.5.4 Force on a current-carrying conductor

4.5.5 The d.c. motor

4.5.6 The transformer

5. Nuclear physics

5.1.1 The atom

5.1.2 The nucleus

5.2.1 Detection of radioactivity

5.2.2 The three types of nuclear emission

5.2.3 Radioactive decay

5.2.4 Half-life

5.2.5 Safety precautions

6. Space physics

6.1.1 The Earth

6.1.2 The Solar System

6.2.1 The Sun as a star

6.2.2 Stars

6.2.3 The Universe

IGCSE Physics 5.2.3 Radioactive decay Question Bank

[Maximum number: 1]

The radioactive isotope radon, ${ }_{86}^{222} \mathrm{Rn}$ , is an alpha ( $\alpha$ ) emitter.
During this radioactive decay, an isotope of polonium, Po, is produced.
How many neutrons does a nucleus of this isotope of polonium contain?

130

132

134

136

[Maximum number: 1]

The nuclei of the atoms in a substance are changing randomly and emitting radiation.
What is happening to the substance?

It is undergoing electromagnetic induction.

It is undergoing magnetisation.

It is undergoing solidification.

It is undergoing radioactive decay.

[Maximum number: 1]

Which row correctly describes an example of radioactive decay?

original
nucleus

emission

change or
no change of element

stable

$\gamma$

change of element

unstable

$\alpha$

change of element

unstable

$\alpha$

no change of element

unstable

$\beta$

no change of element

[Maximum number: 1]

Which change is occurring in a nucleus during $\beta$ -emission?

An electron and a neutron become one proton.

An electron and a proton become one neutron.

A neutron becomes one proton and one electron.

A proton becomes one neutron and one electron.

[Maximum number: 1]

Which change occurs in the nucleus of a radioactive atom during $\beta$ -emission?

A neutron transforms into a proton and an electron.

A neutron transforms into a proton only.

A proton transforms into a neutron and an electron.

A proton transforms into a neutron only.

[Maximum number: 1]

The nucleus of an americium atom contains 146 neutrons and 95 protons. It decays by emitting an $\alpha$ -particle.

How many neutrons and how many protons remain in the nucleus when this form of americium decays?

number of neutrons

remaining

number of protons

remaining

142

144

[Maximum number: 1]

number of neutrons

remaining

number of protons

remaining

142

144

[Maximum number: 1]

Radioactive carbon-14 decays to nitrogen-14 by the emission of a particle.

{ }_{6}^{14} \mathrm{C} \rightarrow{ }_{7}^{14} \mathrm{~N}+\text { particle }

Which particle has been emitted in this process?

a $\beta$ -particle

an $\alpha$ -particle

a neutron

a proton

[Maximum number: 1]

Thorium-230 is represented by the symbol $\stackrel{230}{90} \mathrm{Th}$ . This isotope is radioactive and decays to radium by emitting $\alpha$ -particles.

Which nuclide is produced by this decay?

${ }_{88}^{226} \mathrm{Ra}$

${ }_{89}^{230} \mathrm{Ra}$

${ }_{91}^{230} \mathrm{Ra}$

${ }_{92}^{234} \mathrm{Ra}$

[Maximum number: 1]

A nucleus of americium ${ }_{95}^{243} \mathrm{Am}$ emits an $\alpha$ -particle to form a nucleus of neptunium (Np).
Which equation represents this decay?

${ }_{95}^{243} \mathrm{Am} \rightarrow{ }_{97}^{247} \mathrm{~Np}+{ }_{2}^{4} \alpha$

${ }_{95}^{243} \mathrm{Am} \rightarrow{ }_{96}^{243} \mathrm{~Np}+{ }_{-1}^{0} \alpha$

${ }_{95}^{243} \mathrm{Am} \rightarrow{ }_{94}^{243} \mathrm{~Np}+{ }_{-1}^{0} \alpha$

${ }_{95}^{243} \mathrm{Am} \rightarrow{ }_{93}^{239} \mathrm{~Np}+{ }_{2}^{4} \alpha$

0 selected

Question 34

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Question 38

Question 38