When a wave moves from one medium to another and the speed changes, causing a bend in the line
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What do step up transformers do?
Increase voltage, lower current
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What do step down transformers do?
Decrease voltage to go to houses
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What does 'renewable' mean?
'will never run out'
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How is geothermal energy produced?
Water pumped below ground, uses heat to turn water to steam, can be used to heat buildings
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What is the main evidence for the Big bang?
Red shift: light from galaxies moving away from us is shifted to the red end of the spectrum as wavelength is decreasing. Proves the universe started from one small point.
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What is the wavespeed/wavelength/frequency equation?
wavespeed = frequency x wavelength
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What is diffraction?
The spreading of waves as they pass through a gap
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How do optical fibres work?
Light travels from one end of the cable to another by reflection
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