Physics

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  • Created by: 13aj
  • Created on: 14-04-17 14:35
Density tells us what
how much mass of a certain material is contained within a certain density
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What is the equation for calculating density
Density=Mass
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Water has a greater or smaller density than air
greater
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a turbine driven by a certain volum of water is capable of... than a turbine driven by the same volume of air
generating more electricity
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What are the 8 types of energy
electrical energy, heat energy, kinetic energy, sound energy, light energy, chemical energy, gravitational potential energy and elastic potential energy
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Energy transfers can be shown using...
sankey diagrams
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What are the key points of sankey diagrams
energy input=energy output. Wasted energy is curved downwards or upwards. Width of arrow tells us the amount of energy (to scale). Width of arrow is proportional to the amount of energy (drawn to scale).
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Energy efficiency is a measure of...
how much energy comes out of a device
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% Efficiency=
% Efficiency = USEFUL energy out (or power) transfer
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The... efficient a power station is, the... energy tha is needed to be burnt so the... carbon dioxide emitted and also fossil fuels...
more. less. less. last longer
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`Thermal energy moves from...
high temperatures to low temperatures down a concentration gradient
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The greater the difference in temperature, the... thermal energy...
more. transferred per second
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What are the three types of thermal energy in which it's transferred
Conduction. Convection. Radiation
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What is conduction
IN conduction the thermal energy flows through the object itself. It takes place in solids and liquids
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Conductores are...
materials which are good at conducting thermal energy e.g. metals like copper.
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Insulators are...
materials which are poor at conducting e.g. air, plastic
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What is convection?
Heat flows by convection in liquids and gases only
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In convection, when gas/liquid are... the particles..., the colume of the gas/liquid..., The gas/liquid... , the density... so gas/liquid... , colder denser gas/liquid...
heated. Speed up. Increases. Expands. Decreases. Rises. Falls
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What is thermal radiation (infrared)
Any hot object will emit thermal radiation in the form of infrared electromagneticradiation
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Objects can... heat radiation
emit and absorb
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What are the best emmiter/absorber to the worst emitter/absorber in order
Dull black. Shiny black. Colours (from dark to light). White. Silver
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It is important to try to reduce the... from a house because it will reduce... and reduce...
thermal energy loss. energy bills. carbon dioxide emissions
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What happens if the air is trapped
heat loss through convection is reduced because warm air cannot rise and cold air cannot fall
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Double glazing reduces heat loss...
through conduction and convection
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Drought proofing reduces heat loss...
through convection
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Loft insulation reduces heat loss...
through conduction and convection
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Floor insulation reduces heat loss...
through conduction and convection
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Cavity walls reduces...
conduction and convection
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Foam
traps air (poor conductor) which reduces convection current
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The... of the inside of your house compared to the outside, the more... your house will lose... because of a...
higher the temperature. Energy. Second. Greater difference in temperature
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What is a wavelength
The distance from a crest to the next crest or the distance it takes to repeat itself.
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What is a frequency
The number of waves per second. 1Hz is 1 wave per second.
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What is an amplitude
Distace from middle of the wave to the crest (top). The greater the amplitude of the wave, the more energy the wave is carrying
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What is speed (in terms of waves)
The distance travelled by the wave in 1 second
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What is speed measured in
Metres per second, m/s
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What is amplitude measured in
Metres, m
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What is frequency measured in
Hertz, Hz
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What is wavelength measured in
Metres, m
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The speed of a wave can be calculated in 2 ways...
.
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In order, what has the biggest wavelength to the smallest wavelength
Radio, Microwaves, Infrared, Visible, Ultraviolet, X-ray, Gamma ray
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What has the smallest to biggest increase in frequency and energy
Radio, Microwaves, Infrared, Visible, Ultraviolet, X-ray, Gamma ray
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The frequency and energy... from radio to gamma ray
increase
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The wavelength... from radio to gamma ray
decreases
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Name three common properties of the electromagnetic spectrum
They are transverse waves. Transfers energy/ info from on place to another. Travels at the same speed in a vacuum 3.8
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What are the properties and uses of a radio
longest wavelength. radio signals and tv signals
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What are the dangers and uses of a microwave
Some concern that they pose a health risk to phone users. Absorbed by water molecules. Used for heating food, satellite and mobile phone communications.
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What are the danger and uses of infrared (thermal radiation)
Can burn if you get too much exposure. Used for transmitting information in optical fibres, remote controls and infrared cameras
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What are the dangers and uses of visible light
If the light is too bright it can damage eye/retina. Used for photosunthesis, lasers in CD players
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What are the dangers and uses of ultraviolet
Can ionise cells in the body leading to skin cancer. Used for sun tan beds, detecting forged bank notes
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What are the dangers and uses of x-rays
They are ionising which can lead to cancer. Used for medical imaging, inspection of metal fatigue and airport security
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What are the dangers and uses of gamma
The most ionisising in the em spectrum because they have the most energy. Cancer treatment-killing cancer cells and sterilising medical equipment or food
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Other cards in this set

Card 2

Front

What is the equation for calculating density

Back

Density=Mass

Card 3

Front

Water has a greater or smaller density than air

Back

Preview of the front of card 3

Card 4

Front

a turbine driven by a certain volum of water is capable of... than a turbine driven by the same volume of air

Back

Preview of the front of card 4

Card 5

Front

What are the 8 types of energy

Back

Preview of the front of card 5
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