AQA P1 Revision

77 Pages·2014·3.06 MB·English

by  Greg Ryerson

AQA P1 Revision
Energy
Infrared
Kinetic Theory Transfer by
Radiation
Heating
Heating and Energy Transferring
Insulating Transfers and Electrical
Buildings Efficiency Energy
Generating The National
Waves
Electricity Grid
Red Shift and
Reflection Sound the Big Bang
Theory
Infrared Radiation
a) All objects emit and absorb infrared radiation.
b) The hotter an object is the more infrared radiation it radiates in a
given time.
c) Dark, matt surfaces are good absorbers and good emitters of
infrared radiation.
d) Light, shiny surfaces are poor absorbers and poor emitters of
infrared radiation.
e) Light, shiny surfaces are good reflectors of infrared radiation.
Emitting Infrared Radiation
All objects emit (give out) some thermal radiation.

Certain surfaces are better at emitting thermal radiation than
others.
best emitter worst emitter
matt
white silver
black
Matt black surfaces are the best emitters of radiation.
Shiny surfaces are the worst emitters of radiation.
Which type of kettle would cool down faster:
a black kettle or a shiny metallic kettle?
Absorbing Infrared Radiation
Infrared waves heat objects that absorb (take in) them.
best emitter worst emitter
matt
white silver
black
best absorber worst absorber
Matt black surfaces are the best absorbers of radiation.
Shiny surfaces are the worst emitters because
they reflect most of the radiation away.
Why are solar panels that are used for heating
water covered in a black outer layer?
Infrared Radiation – Exam Questions
Kinetic Theory
a) The use of kinetic theory to explain the different states of
matter.
b) The particles of solids, liquids and gases have different amounts
of energy.
Kinetic Theory
As you heat a substance, the heat energy is transferred to the particles
in the substance as kinetic energy.
This causes the particles to move further apart, decreasing the density
of the substance.
Kinetic Theory
A loss of heat energy will cause the opposite effect.
Kinetic Theory – Exam Questions