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Does a hot or cold object give off more infa red radiation?
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Where do electromagnetic waves travel through?
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What does the Sun emit?
Electromagnetic Radiation
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What is the greenhouse effect?
Short wavlength infared radiation (from Sun) can't pass through the atmosphere. Infared radiation is trapped inside the atmosphere
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What do metals contain?
Free electrons
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What happens when a metal is heated?
Conduction - free elctrons gain kinetic energy and diffuse colliding with cooler free electrons
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How does Conduction work in non - metals?
Atoms vibrate and shake eachother
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What state does convection occur in?
Liquids and Gases
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What properties cause objects to heat up quicker?
Amount of energy supplied to it, Mass, What the substance is
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What is waters specific heat capacity?
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What is specific heat capacity?
Amount of energy needed to heat 1kg of a substance by 1 degree
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What is the unit for Energy?
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What is the unit for specific heat capacity?
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What is a U-Value?
The energy per second that passes through one square metre of material when the temperature difference across it is 1*C
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Energy cannot be.....
created or destroyed
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Waste energy is.............to the surroundings
Dissipated (spreads out)
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When does energy become less useful?
WHen it spreads out
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What is the unit for weight?
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What is power?
The Energy we supply per second tp something
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More powerful an appliance............
The Faster the rate at which it transfers energy
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What is the unit for power?
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What Methane an example of?
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What is a biofuel?
Any fuel obtained from living or recently living organisms
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What does carbon - neutral mean?
Carbon taken in from atmospher balances out when it is burned
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What fuel is used in nuclear power station?
Uranium of Plutonium
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How is energy obtained in nuclear power staions?
When the nucleas of Uranium splits in two(fission)
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How is the energy of the core transferred?
By the fluid, coolant
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How much energy do solar panels convert?
Less than 10%
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Where does Geothermal energy come from?
Radiocative substances in rock
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What does burning fossil fuels release?
Carbon Dioxide and Sulfur Dioxide
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What is the National Grid?
Network of cables that distributes electricity from power stations to homes
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What voltage do Power Stations produce electricity at?
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What are mechanical waves?
Sound waves. Water waves, Waves on springs, etc
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The bigger the amplitude......
The more energy the waves carry
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What is the unit of frequency?
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What is the speed of waves?
The distance travelled by a wave crest of trough every second
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What is the angle of incidence?
The angle between the incidence ray and the normal
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What is the angle of reflection?
Angle between the reflected ray and normal
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When a light ray hits glass it...........
changes direction towards the normal
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What is diffraction?
Spreading out of waves
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Diffraction occurs more in...........
smaller gaps
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What are electromagnetic waves?
Electric and Magnetic disturbances that transfer energy from one place to another
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What speed do electromagnetic waves travel through a vacuum?
300million n/s
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What is white light?
Light from ordinary lamps and the sun
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What is the Doppler Effect?
The change in the observed wavelength of waves due to the motion of the source of the waves
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What does red - shift show us?
How far away galaxies are
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Does a smaller or bigger distance have more red-shift?
Bigger distance
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What is the Big Bang Theory?
The universe is expanding after exploding suddenly in a Big Bang
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Other cards in this set

Card 2


Where do electromagnetic waves travel through?



Card 3


What does the Sun emit?


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Card 4


What is the greenhouse effect?


Preview of the front of card 4

Card 5


What do metals contain?


Preview of the front of card 5
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I agree with NiravM, the questions don't make sense 

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