Which state does conduction occur in?
Solids
Liquids
Gases
Do black, matt objects absorb better than light, shiny objects?
Condensation is faster if...?
Temperature of the gas is higher.
Gas has a higher density.
Non-metals conduct better than metals?
In evaporation what happens to the overall energy and speed of the particles?
Overall energy and speed of particles decreases as particles evaporate
Overall energy and speed of particles stays the same as particles evaporate
Overall energy and speed of particles increases as particles evaporate
Evaporation is the change of state from a liquid to gas?
In a vacuum flask, which two features are used to prevent conduction?
Cao made of plastic and filled with cork.
Silver lining.
Insulation foam supporting the bottle.
In a cold climate, do animals have large ears or small ears to prevent heat loss?
Large ears
Small ears
If the intial cost of loft insulation is £100 and the annual saving is £20, how many years will the payback time take?
4 years
200 years
5 years
U-Values show how slow heat transfers through a material
Which two methods of insulation reduce heat transfer by conduction and convection
Thick curtains
Cavity wall insulation
Hot water tank jacket
The principal of conservation of energy means that energy cannot be created or destroyed.
What is the efficiency of an energy-saving lightbulb that converts 60J of energy into 40J of light energy
1.5
3
20
Carbon dioxide can be 'captured' before it is released from burning fossil fuels and pumped into oil and gas fields beneath the sea.
What do transformers do when transferring electricity from the National Grid to consumers?
Maintain the voltage of electricity.
Increase the voltage so that current is decreased whilst transferring electricity through pylons and then decrease to lower voltages for consumers.
What two ways provide energy during peak demands of electricity?
Carbon capture fields.
pumped storage systems such as that of a hyrdroelectric power
Biofuel from vegetable oils.
Underground cables have a higher set-up cost than overhead cables but are less reliable and harder to access.
What is the order of the Electromagnetic spectrum?
Radio, Microwaves Infra-red, Visible light, Ultraviolet, X-rays, Gamma rays.
Microwaves, Visible light, Ultraviolet, X-rays, Radio, Gamma rays.
All waves travel at the same speed through a vacuum
Transverse waves are?
Perpendicular to the direction of energy transfer
parallel to the direction of energy transfer
Longitudinal waves show areas of compression and rarefraction?
What is the formula for wave speed?
Wave speed = frequency x wavelength
Wave speed = frequency divided by wavelength
The angle of incidence is equal to the angle of reflection?
When waves diffract,, how big will the diffraction be if the gap is slightly wider than the wavelength?
Diffracts only at edges.
Little diffraction
Maximum diffraction
Waves only defract if they meet a new medium at an angle
If a wave is travelling along the normal, the speed changes and the wave is defracted.
