Physics

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What's the difference between heat & temperature?
Heat is a measure of energy, temperature is a measure of hotness.
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How do you work out energy?
Energy = Mass x SHC x Temperature Change
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What is Specific Latent Heat?
The energy needed to change state
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What's conduction?
When vibrating particles pass energy on to nearby particles.
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What's convection?
When particles move to a cooler region with their energy.
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What objects emit and absorb heat radiation?
All of them - especially matte black surfaces
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How can you insulate your home?
Loft insulation, water tank jackets, thick curtains, double glazing, cavity walls & insulation, draught proofing.
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How do you calculate efficiency?
Efficiency = Useful Energy Output / Total Energy Input (x100%)
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What represents the amount of energy in a sankey diagram?
The thickness of the arrow.
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How do you calculate wave speed?
Speed (m/s) = Frequency (Hz) x Wavelenght (m)
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What is the law of reflection?
Angle of incidence = Angle of reflection
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What's diffraction?
Waves spreading out
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What's refraction?
Changing the speed of a wave which changes the direction
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What are the 7 types of EM waves?
Radio Waves - Microwaves - Infrared - Visible Light - Ultra Violet - X-Rays - Gamma Rays
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What ways can you communicate with light?
Morse code or optical fibres
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What kind of light do lasers produce?
Monochromatic
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What are the uses for infrared around the home?
Cooking, Remote Controls, Short-distance Information, Security Systems, Optical Fibres
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How do radio waves travel?
They can travel through the atmosphere as they have long wavelengths and they refract/diffract
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What are the uses of microwaves?
Cooking, Satellite Communication & Mobile Phones
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How do EM receivers work?
The size of the receiver depends on the size of the wave. Telescopes detect different types of wave
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What's the difference between analogue & digital signals?
Analogues have a range of values but digital only have two.
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What's the problem with UV Radiation?
It causes skin cancer so the ozone protects us from the UV of the sun.
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What is the difference between P&S Waves?
P waves are longitudinal (they travel along the wave) S waves are tranSverse (they travel at right angles to the wave)
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What does a seismograph do?
Tells us where P waves & S waves are inside the Earth
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Other cards in this set

Card 2

Front

How do you work out energy?

Back

Energy = Mass x SHC x Temperature Change

Card 3

Front

What is Specific Latent Heat?

Back

Preview of the front of card 3

Card 4

Front

What's conduction?

Back

Preview of the front of card 4

Card 5

Front

What's convection?

Back

Preview of the front of card 5
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