p1 foundation. house insulation methods how many can you name?
TRANSCRIPT
P1 foundation
House Insulation Methods
How many can you name?
savings payback time draught proofing cavity insulation
cheapest double glazing
highest savings loft insulation
budget cost 6 years
R M IR V UV X G
Uses
Dangers
Long frequency
Low
wavelengthHigh
energy
No dangers least most
dangerous
Long wavelengthHigh frequencyHigh energy
Long wavelengthLow frequencyLow energy
Radiowaves
Microwaves
Infra-red
Visible
Ultra-violet
X-rayGamma rays
Uses
DangersHeating water
in tissue – can burn
Can burn skin over
time
Can damage eyes if too
intense
Burns skin, can cause
skin cancer
High doses can kill healthy cells
Even low doses can kill healthy
cells
Transmits information over radios
Cooking food and mobiles
Remote controls and
thermal imaging
Seeing, optical fibres
Sun beds, fluorescent
tubing, security marking
Taking pictures of bones
Killing cancer cells, sterilising
hospital equipment
P1 higher
Does it reduce conduction, convection or radiation?
conduction convection radiation air insulatorkinetic energy energy loss windows walls savings
particles transfer thickness dense heat
Energy = mass x SHC x change in temp
transferred
Units
EnergyMass
Specific heat capacityTemperature
JKg
J/KgoCoC
R M IR V UV X G
Uses
Dangers
Long frequency
Low
wavelengthHigh
energy
No dangers least most
dangerous
Long wavelengthHigh frequencyHigh energy
Long wavelengthLow frequencyLow energy
Radiowaves
Microwaves
Infra-red
Visible
Ultra-violet
X-rayGamma rays
Uses
DangersHeating water
in tissue – can burn
Can burn skin over
time
Can damage eyes if too
intense
Burns skin, can cause
skin cancer
High doses can kill healthy cells
Even low doses can kill healthy
cells
Transmits information over radios
Cooking food and mobiles
Remote controls and
thermal imaging
Seeing, optical fibres
Sun beds, fluorescent
tubing, security marking
Taking pictures of bones
Killing cancer cells, sterilising
hospital equipment
P2 foundation
Alpha Beta Gamma
Most ionising
Penetrating Used to treat cancer sterilise
equipment
Stopped by aluminium
Stopped by paper
Used in smoke alarm
Most penetrating Used in paper mills
Least ionising
Least penetrating
Reduced by lead/ concrete
Ionising
Alpha Beta Gamma
Most ionisingUsed in smoke
alarmsLeast penetratingStopped by paper
IonisingUsed in paper
millsPenetratingStopped by aluminium
Least ionisingUsed to treat cancer /
sterilise equipmentMost penetrating
Reduced by concrete or lead
Uranium: alpha, long half life, very radioactive, needs cooling, buried in glass, not penetratingIodine: highly penetrating, beta and gamma, short half life, very radioactive, need cooling, thick walled containers, metres of concrete,
Mixed: short half life, slightly radioactive, land fill, deep underground, concrete, highly penetrating
Meteor
http://www.youtube.com/watch?v=OGbgt5bN-g0
P2 higher
Alpha Beta Gamma
Alpha Beta Gamma
Most ionisingUsed in smoke
alarmsLeast penetratingStopped by paper2 protons and 2
neutrons
IonisingUsed in paper
millsPenetratingStopped by aluminium
A fast moving electron
Least ionisingUsed to treat cancer /
sterilise equipmentMost penetrating
Reduced by concrete or lead
An electromagnetic wave
Uranium: alpha, long half life, very radioactive, needs cooling, buried in glass, not penetratingIodine: highly penetrating, beta and gamma, short half life, very radioactive, need cooling, thick walled containers, metres of concrete,
Mixed: short half life, slightly radioactive, land fill, deep underground, concrete, highly penetrating
Red shift and big bang
http://www.youtube.com/watch?v=U-OUP_mXMCw
Red shift and big bangWe know the universe is expanding because of the Doppler effect. You may have noticed that when an ambulance or police car goes past, its siren is high-pitched as it comes towards you, then becomes low-pitched as it goes away. This effect, where there is a change in frequency and wavelength, is called the Doppler effect and it doesn't only happen with sound.
We can see it happening with light when we look at distant stars. The light is being stretched towards the red end of the spectrum because the object is moving away from us, just as it was with the police car. Evidence for this is shown by the location of these black lines in the spectrum of our Sun and in other stars. The black lines are where different elements such as helium absorb light. They are shifted towards the red end of the spectrum because of the Doppler effect. But be careful, just because things moving away from us are shifted towards the red end of the spectrum, doesn't mean they necessarily look red, they just have a longer wavelength.
