Physics Unit 1

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  • Created by: jenni2906
  • Created on: 06-06-15 12:11
What wave can be transverse and longitudinal?
Mechanical wave.
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What is a transverse wave?
Oscillation of transverse wave is perpendicular to the direction of energy transfer.
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What is a longitudinal wave?
Longitudinal wave is parallel to direction of energy transfer.
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Why does a metal conduct electricity?
Free electrons, kinetic energy of free electrons increases when heated so move faster, electrons transfer energy to other electrons.
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What is convection?
Water particles gain energy, move apart, water becomes less dense and warm water rises causing convection currents.
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What has the shortest wavelength?
Gamma.
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What is a virtual image?
Cannot be formed on a screen.
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What is the wavelength of electromagnetic waves?
10-15m to 104m.
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What is infrared used for?
Communications, TV remote controls.
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What is the doppler effect?
Change in wavelength when source of waves moves.
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What is red shift?
Increase in wavelength of light galaxy moving away from earth.
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What are radiowaves and microwaves?
Transverse, so can be reflected.
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What are microwaves used for?
Communications, can pass through ionosphere.
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What is a good emitter of radiation?
The colour black.
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What is a better emitter of radiation?
Matt surfaces are better than shiny surfaces.
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What is good about wood?
Renewable, carbon neutral.
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What increases the rate of energy transfer?
Bigger the surface area, the faster the rate of energy transfer.
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What does red shift show?
Galaxies are moving away from eachother, further the galaxy, bigger the red shift, shows the universe started with a single point of origin.
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What is plastic?
Poor conductor, stops convection currents and stops energy transfer.
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What is glass?
A poor conductor, reduces energy transfer by conduction.
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How does a vacuum stop energy transfer?
Conduction and convection require particles.
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How is a virtual image formed?
By virtual rays crossing.
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What are the advantages and disadvantages of wind turbines?
Free, renewable, unreliable.
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How do overhead cables work?
Voltage of overhead cables is high, current is reduced which reduces energy loss which increases the efficiency of transmission.
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What is a pumped storage hydroelectric power station?
Can store energy for later use. Water is pumped up to a higher resevoir.
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What is a step-up transformer?
Increases voltage across cables, reduces energy loss in cables so increases efficiency of transmission.
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What are the advantages and disadvantages of overhead cables?
Easy to repair, spoils landscape, air acts as electrical insulator, hazardous to low flying aircraft.
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What is double glazing?
Provides insulation, inside of glass is not as cold.
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What does lowering the U-value do?
Makes the insulation better.
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What is the U-value?
How effective a material is as an insulator.
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What happens to wasted energy?
Dissipates into the surroundings.
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What is geothermal energy?
Energy from hot rocks in earth.
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What is biogas?
Renewable, free, reliable.
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What does is mean to decommission a nuclear power station?
Dismantle and remove radioactive waste.
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What does draught do?
Increase evaporation.
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What is carbon capture?
CO2 not released into the atmosphere but is caught and stored in huge natural containers.
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How do you work out payback time?
Initial cost divided by annual saving.
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How do you work out specific heat capacity?
Energy transferred = mass x specific heat capacity x temp change.
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How do you work out efficiency?
Useful energy out divided by total energy in.
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How do you work out energy?
Power x time.
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How do you work out wave speed?
Frequency x wavelength.
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Other cards in this set

Card 2

Front

What is a transverse wave?

Back

Oscillation of transverse wave is perpendicular to the direction of energy transfer.

Card 3

Front

What is a longitudinal wave?

Back

Preview of the front of card 3

Card 4

Front

Why does a metal conduct electricity?

Back

Preview of the front of card 4

Card 5

Front

What is convection?

Back

Preview of the front of card 5
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