OCR A 16 - Working waves

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Working waves

16.2.4 Modern Communication Systems – How Cell-Phones and Broadband Work

16.2.5 The Work of Radiologists X- and γ-Ray Imaging and Therapy

Week 4

theraputic use of radiation

advanteages of technetium-99

6 hour half life

anger/gamma camras

prinicples of radioactive tracers

Week 3

CAT scans

protection measures

image intensifiers

meter exposure

reduce exposure

health hazards

cell damage by ionisation

improvign x-ray quality

narrow beam

beam filtration

grid

Extending the EM Spectrum into the X & Y ray spectra

difference in absorbtion of x-rays

appearence of x-rays on film

16.2.3 How Optical Fibres Carry Data

16.2.2 How Infrared Imaging Works

Week 2

Week 1

16.2.1 Wave properties

Subtopic

describe the features belonging to some waves, but not others;

EM SPECT

how it interacts with matter

detection

how it varies with frequency

transmission

production

describe the features unique to electromagnetic waves;

can exist in vacuum

vibrating fields

Needs a medium

vibrating matter

Longitudinal

Transverse

Different speeds

describe the features common to all waves;

recall and use v = fλ;

amplitude

period

energy transfer

frequency

higher - more energy

wavelenght