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Published byNathan Stevenson Modified over 9 years ago
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P1 Unit 6 Electromagnetic Waves
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Electromagnetic Spectrum
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Infrared Radiation – used to transmit remote control signals and inside optical fibres Microwaves – used for mobile phones and satellite TV. Radio waves- also used for mobile phones, radio and TV broadcasts Communications
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UV – blindness, skin cancer Microwaves and radio waves – internal heating Infra-red – Skin burns Gamma and x rays – DNA mutations and Cancer Dangers
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All space, matter and time were ‘created’ in the Big Bang Since then the universe has been expanding. Proof of the expansion – Red shift and CMBR Expanding universe
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Hubble discovered… The distant galaxies are receding The further away they are the faster they are receding Expanding universe
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Cosmic microwave background radiation is the remnants of the electromagnetic radiation created just after the Big Bang. CMBR
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