4.4

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·         4.4 recall and use the relationship:

Version 1

 

Efficiency = Useful E_out / Total E_in x 100

 

Useful E_out =useful energy output

Total E_in = useful energy input

Version 2

 

Efficiency = Useful E_out / Total E_in

 

Useful E_out = useful energy output (j)

Total E_in = total energy input (between 0 and 1)

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3.19- refraction

3.16- plane mirrors

For plane mirrors, the image is...
- the same size of the object
- the same distance as the object from the mirror
- virtual (not real)
- upright
- laterally inverted

3.17- mirrors

3.13- dangers to humans

microwaves- internal heating of body tissue

infrared- skin burns

ultraviolet- damage to surface cells
               - blindness

gamma rays- cancer
                   - mutation

3.12- uses of electromagnetic waves

tv and radio waves
- tv
- radio

microwaves
- cooking
- satellite transmissions

infrared
- tv remotes
- heaters and night vision equipment

visable
- photography
- optical fibres

ultraviolet
- sun tanning

x-rays
- airports
- hospitals

gamma rays
- medical equipment