P1 Flashcards

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  • Created by: adrik146
  • Created on: 01-02-17 19:34
What is heat a measure of?
Energy
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What is temperature a measure of?
Hotness
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What is Specific Heat capacity and what is the formula for it?
A measure of how much energy can be stored. E=MxSHCxTemp. Change
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What is specific latent heat and what is the formula for it?
How much energy it takes to change the substance of something. SLT=E/M
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What happens if there is a difference in temperature?
Energy flows
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In what can conduction occur?
Solids and Liquids
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What does conduction use?
Particles
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Why is conduct faster in solids than liquids?
Particles are closer together so vibrations are passed on more easily.
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What can convection occur in?
Liquids and gases
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How does convection work?
Heats the substance so it becomes less dense, rises and at top it cools so it becomes more dense and goes backdown creating a convection current.
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Why can't convection occur in solids?
Particles wouldn't let convection current occur.
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Where can radiation occur?
Anywhere as it doesn't use particles, it uses waves.
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What do different objects do with radiation?
Dark absorb, shiny reflect, some emit.
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What can be used to show where most heat is lost?
Thermograms
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What is the formula for efficiency?
total useful/total in x 100% = efficiency
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How do you calculate wave speed?
speed (m/s) = frequency (Hz) x wavelength (m)
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What is refraction and where and why does it occur?
Bending of waves because they are slowed down in desnser substances e.g. glass
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what is diffraction?
Waves getting bigger.
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What is the difference between he diffraction of sound and light?
light requires the same size hole as wavelength
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What is reflection?
light bouncing off an object.
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What does the angle of reflection equal to?
Angle of incident
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What does TIR stand for?
Total internal reflection
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Where does TIR occur?
Over the critical angle in a dense material
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What are the 7 EM waves in order?
Radio, micro,infrared, visible light, UV, X-ray, gramma ray
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What is visible light used for?
To transort signals
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What can light be transported through?
Optical fibres
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What does visible light need to give a signal?
A code (eg morse code)
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how is a laser different to normal light?
It is monochromic and in the waves are in phase.
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What do radio waves with long wavelengths do?
Refract around earth
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What do radio waves with short wavelengths do?
Refract off ionosphere
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What are they used for?
Communication, cooking
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What must they have to give a good signal?
Transmitters in line of sight
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What are infrared waves?
heat (e.g. from sun)
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What are they used for?
Cooking
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How do infrared waves cook food?
From outside to inside
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How do microwaves cook food?
Go one centimetre into food and cook it from inside by making water molecules spin.
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What are microwaves used for?
Cooking and mobile phones and satellite communication
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What is the problem with mobile phone mast?
Can be dangerous
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How is information transmitter?
As signals
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What is the difference between analogue and digital signals?
Digital is either on of off (1/0) and analogue can be any value.
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Why are digital signals better?
Less interference, multiplexing (several different signals)
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What type of radiation cause cancer?
UV
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What does SPF stand for and what does the value mean?
Sun protection factor and how many times longer you can stay in the sun for without getting burnt.
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What protects us from UVs from sun?
Ozone layer
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What is the problem with the ozone layer and how was it caused?
It has a hole in it over antartica and its because of human use of CFCs which damage ozone particles.
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Describe the 3 properties of S waves.
Transverse, only through solids, sower than p waves.
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Describe 3 properties of P waves
Longitudinal, solids and liquids, faster than S waves.
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What are seismic waves used for?
To detect earth quakes and all the different layers of the earth.
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Other cards in this set

Card 2

Front

What is temperature a measure of?

Back

Hotness

Card 3

Front

What is Specific Heat capacity and what is the formula for it?

Back

Preview of the front of card 3

Card 4

Front

What is specific latent heat and what is the formula for it?

Back

Preview of the front of card 4

Card 5

Front

What happens if there is a difference in temperature?

Back

Preview of the front of card 5
View more cards

Comments

Karimah_Khanum

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The how does conduction work, should be how does convection work but overall really good.

adrik146

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I corrected the mistake thanks for the feedback! :)

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