# Physics foundation unit 1

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• Created by: jessica
• Created on: 17-06-13 16:32
How can the speed of a wave be calculated?
Frequency and wavelength
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How do waves travel?
Vibrations
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What is the frequency of a wave?
The number of waves.
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What do electricity meters measure?
Number of units of electricity used
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What does the temperature increase depend on?
Mass, substance and amount of energy transferred into the object
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How do we calculate the amount of electrical energy?
How much it costs to run
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what does T mean in an equation?
Time in hours
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What does P mean in an equation?
Power in kW
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What does E mean in an equation?
Energy transferred into kWh
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What is the equation including E,P,T?
E=PxT
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How do you covert W into kW?
Divide W by 1,000 to get kW
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How do you convert seconds into hours?
Divide seconds by 3600 to get hours
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How is heat transferred?
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Do dark matt surfaces absorb heat better or worse than light shiny surfaces?
Better
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Do all objects give out or absorb radiation?
all objects give out AND absorb radiation
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What is conduction?
its heat energy which moves through a substance
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Are Metals good at conducting heat?
Yes
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Are Non-Metals good at conducting heat?
No
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What are poor conductors of heat good for?
insulating heat
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What is convection?
Liquids and Gases which transfer heat by moving from place to place
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What happens to liquids and gasses when heated?
The particles expand
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The bigger in temperature between an object and its surroundings means what?
The greater the rate at which heat energy is transferred
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what does U-values measure?
effectiveness of material as an insulator
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the lower the U-value means what?
the better the material is as a heat conductor
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What is a cavity wall used for?
insulating
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Is it best for this?
Yes
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What does double glazing and extra insulation do for someone?
reduce heat energy loss and saves money
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What does the temperature do?
measure how hot or cold something is
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What does the heat do?
measure the thermal energy contained in an object
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What is the temperature measured in?
°C
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What is the heat measured in?
J
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What does the greater the amplitude of a sound wave mean?
the louder the sound
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What does the greater the frequency mean?
the higher the pitch
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How can white light be split?
using a prism
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Give an example of what Radio waves are used for?
TV signals
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Give an example of what micro waves are used for?
Cooking, mobiles
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Give an example of what Infra red is used for?
optical fiber communication
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Give an example of what visible light is used for?
Seeing
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Give an example of what ultraviolet is used for?
detecting forged bank notes
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Give an example of what X-rays are used for?
Medical images
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Give an example of what Gamma rays are use for?
Killing cancer cells
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How would you measure the total cost of units of electricity used?
number of units x cost per unit
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Work out if the total cost of per unit was £4.77 and the number of units was 223
£1063.71
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Double glazing might cost £2,500 and save £100 a year. How would you figure out the pay back time?
pay back time = cost of energy ÷ money saved
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Double glazing might cost £2,500 and save £100 a year. What is the pay back time?
2,500 ÷ 100 = 25 years
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## Other cards in this set

### Card 2

#### Front

How do waves travel?

Vibrations

### Card 3

#### Front

What is the frequency of a wave?

### Card 4

#### Front

What do electricity meters measure?

### Card 5

#### Front

What does the temperature increase depend on?