Page 1 of 62
IGCSE Physics - Study Guide Combined BUNDLE ( Latest
2025)
a.c generator .....ANSWER.....A device, such as a dynamo, used to
generate alternating current (a.c)
acceleration .....ANSWER.....The rate of change of an object's
velocity
acceleration due to gravity .....ANSWER.....The acceleration of an
object falling freely under gravity
activity .....ANSWER.....The rate at which nuclei decay in a sample
of a radioactive substance
air Resistence .....ANSWER.....The frictional force on an object
moving through air
alpha decay .....ANSWER.....The decay of a radioactive nucleus
by emission of an a-particle
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alpha particle (a-particle) .....ANSWER.....A particle of two
protons and two neutrons emitted by an atomic nucleus during
radioactive decay
alternating current (a.c) .....ANSWER.....Electric current that flows
first one way, then the other, in a circuit
ammeter .....ANSWER.....A meter for measuring electric current
amp, ampere (A) .....ANSWER.....The SI unit of electric current
amplitude .....ANSWER.....The greatest height of a wave above
its undisturbed level
angle of incidence .....ANSWER.....The angle between an incident
ray and the normal to the surface at the point where it meets a
surface
angle of reflection .....ANSWER.....The angle between a reflected
ray and the normal to the surface at the point where it meets a
surface
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angle of refraction .....ANSWER.....The angle between a
refracted ray and the normal to the surface at the point where it
passes from one material to another
average speed .....ANSWER.....Speed calculated from total
distance travelled divided by total time taken
axis .....ANSWER.....The line passing through the centre of the
lens, perpendicular to its surface
background radiation .....ANSWER.....The radiation from the
environment to which we are exposed all the time
barometer .....ANSWER.....An instrument used to measure
atmospheric pressure
battery .....ANSWER.....Two or more electrical cells connected
together in series; the word may also be sued to mean a single
cell
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becquerel (Bq .....ANSWER.....The SI unit of activity; 1 Bq = one
decay per second
beta decay .....ANSWER.....The decay of a radioactive nucleus
by emission of a beta particle
beta particle .....ANSWER.....A particle (an electron) emitted by
an atomic nucleus during radioactive decay
biomass fuel .....ANSWER.....A material, recently living, used as a
fuel
boiling point .....ANSWER.....The temperature at which a liquid
changes to a gas (at constant pressure)
Boyle's law .....ANSWER.....The law that relates the pressure and
volume of a fixed mass of gas
brownian motion .....ANSWER.....The motion of small particles
suspended in a liquid or gas, caused by molecular bombardment
IGCSE Physics - Study Guide Combined BUNDLE ( Latest
2025)
a.c generator .....ANSWER.....A device, such as a dynamo, used to
generate alternating current (a.c)
acceleration .....ANSWER.....The rate of change of an object's
velocity
acceleration due to gravity .....ANSWER.....The acceleration of an
object falling freely under gravity
activity .....ANSWER.....The rate at which nuclei decay in a sample
of a radioactive substance
air Resistence .....ANSWER.....The frictional force on an object
moving through air
alpha decay .....ANSWER.....The decay of a radioactive nucleus
by emission of an a-particle
,Page 2 of 62
alpha particle (a-particle) .....ANSWER.....A particle of two
protons and two neutrons emitted by an atomic nucleus during
radioactive decay
alternating current (a.c) .....ANSWER.....Electric current that flows
first one way, then the other, in a circuit
ammeter .....ANSWER.....A meter for measuring electric current
amp, ampere (A) .....ANSWER.....The SI unit of electric current
amplitude .....ANSWER.....The greatest height of a wave above
its undisturbed level
angle of incidence .....ANSWER.....The angle between an incident
ray and the normal to the surface at the point where it meets a
surface
angle of reflection .....ANSWER.....The angle between a reflected
ray and the normal to the surface at the point where it meets a
surface
,Page 3 of 62
angle of refraction .....ANSWER.....The angle between a
refracted ray and the normal to the surface at the point where it
passes from one material to another
average speed .....ANSWER.....Speed calculated from total
distance travelled divided by total time taken
axis .....ANSWER.....The line passing through the centre of the
lens, perpendicular to its surface
background radiation .....ANSWER.....The radiation from the
environment to which we are exposed all the time
barometer .....ANSWER.....An instrument used to measure
atmospheric pressure
battery .....ANSWER.....Two or more electrical cells connected
together in series; the word may also be sued to mean a single
cell
, Page 4 of 62
becquerel (Bq .....ANSWER.....The SI unit of activity; 1 Bq = one
decay per second
beta decay .....ANSWER.....The decay of a radioactive nucleus
by emission of a beta particle
beta particle .....ANSWER.....A particle (an electron) emitted by
an atomic nucleus during radioactive decay
biomass fuel .....ANSWER.....A material, recently living, used as a
fuel
boiling point .....ANSWER.....The temperature at which a liquid
changes to a gas (at constant pressure)
Boyle's law .....ANSWER.....The law that relates the pressure and
volume of a fixed mass of gas
brownian motion .....ANSWER.....The motion of small particles
suspended in a liquid or gas, caused by molecular bombardment
