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1a)suggest whether or not having a mast storage can be dangerous? is it difficult to make conclusions about the dangers of microwaves in mobile phones?in support of danger max. two from possible health risks from radiation / m.w. [1]
concentrated microwaves / lots of signals emitted / greater power near the mast [1]
b)
lack of (enough) data / quality of data [1]
idea of conflicting evidence [1]
long time for symptoms to occur [1]
24) How does light travel along a Optical fibre? information can also be carried along copper wires. How are optical fibres a better way of carrying information?total internal reflection / TIR [1]
b)
more information capacity / higher transmission rate / transmits information or data or signal more quickly / AW [1]
less (chance of) interference / tapping / hacking / idea of interference can be removed [1]
3how is a beam of light from a laser different to a beam from a torch?beam of single coloured / monochromatic light [1] but (narrow or intense) beam of light that is same frequency / wavelength [1] has low divergence [1] b)