# P1 Revision Cards

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• Created by: Franke
• Created on: 09-06-13 10:24
Does Energy flow from a warmer to a colder body?
Yes
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When Energy flows away from a warm body what happens to the temperature of the object?
It's temperature decreases
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When the temperature of a body increases what happens to the average kinetic energy?
The kinetic energy of particles increases
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What is the formula for specific heat capacity
Energy Transfered = Mass x Specific Heat Capacity x Temperature change
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What is the formula for specific latent heat
Energy Transfer = Mass x Specific Latent Heat
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What does warm air do?
Rise
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Cavity Wall Insulation reduces energy loss by..
Conduction and convection
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Define Conduction
Energy is transferred due to the transfer of kinetic energy
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Define Convection
Energy is transferred by a gas expanding when it is heated. This means it is less dense, so it rises. The unit of density is Kg/m cubed or g/cm cubed
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What is the formula to find density?
Density = Mass/Volume
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Define Radiation
Energy Transferred by radiation does not need a material to transfer energy. Energy can be transferred through a vacuum
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What is the Energy Efficiency Formula
Efficiency = Useful Energy Output (x100%) DIVIDED BY Total Energy Input
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What is the Payback Time Formula
Payback Time = Cost Of Insulation DIVIDED BY Annual Saving
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What is the Amplitude of a wave?
Maximum displacement of a particle from its rest position
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What is the Crest of a wave?
The highest point on a wave below its rest position
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What is the trough of a Wave?
the lowest point on a wave below its rest position
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What is the wavelength of wave?
the distance between two successive points on a wave having the same displacement and moving in the same direction
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What is the frequency of a wave?
The number of complete waves passing a point in one second
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Equation for speed of a wave?
Wave speed = Frequency x Wavelength
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Why does refraction occur?
Because the speed of the waves decreases when the wave enters a denser medium and increases as the wave enters a less dense medium
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Define Diffraction
Spreading out of a wave as it passes through a gap
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What is White light made up of?
Different colours of different frequencies out of phase
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What is a laser light?
Single frequency in phase shows low divergence.
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When light travels from one material to another it is....
Refracted
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If the light is passing from a denser material to a less dense one the angle of refraction is....
Larger than the angle of incidence
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When the angle of refraction is 90 degrees Celsius the angle of incidence is called...
a critical angle
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If the angle of incidence is bigger than critical angle the light is.....
reflected and this is called total internal reflection
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## Other cards in this set

### Card 2

#### Front

When Energy flows away from a warm body what happens to the temperature of the object?

#### Back

It's temperature decreases

### Card 3

#### Front

When the temperature of a body increases what happens to the average kinetic energy?

### Card 4

#### Front

What is the formula for specific heat capacity

### Card 5

#### Front

What is the formula for specific latent heat

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