EM SPECTRUM

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GAMMA RAYS

HIGHEST ENERGY WAVES IN THE EM SPECTRUM

SHORTEST WAVELENGTH

HIGH PENETRATING POWERS

COME FROM THE NUCLEUS OF A RADIOACTIVELY DECAYED ATOM

CAN KILL/DAMAGE CELLS

USED IN RADIOTHERAPY

USED TO STERILISE MEDICAL EQUIPMENT

 

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RADIATION

HUNDREDS OF BEAMS ARE DIRECTED AT UNHEALTHY CANCEROUS CELLS, TO KILL THEM.

THEY ARE SHONE IN DIFFERENT ANGLES SO THE HEALTHY CELLS HAVE TIME TO RECOVER

THINNER BEAMS= MORE ACCURACY

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X-RAYS

X-RAYS ARE HIGH ENERGY WAVES

HIGH PENETRATION

WAVES ARE ABSORBED BY BONE TRANSMITTED THROUGH SOFT TISSUE

USED IN MEDICAL IMAGING

X-RAYS IOINISE CELLS (CAUSES CANCER)

USED IN SECURITY SCREENING



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VISIBLE LIGHT

MIDDLE OF EM SPECTRUM

USED IN PHOTOGRAPHY

LASERS ARE VISIBLE LIGHT

CAN BLIND YOU

VIBGYOR


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UV RAYS

WE CANNOT SEE UV RAYS DIRECTLY

USED IN SECURITY AND FORGERY DETECTION

USED IN FORENSICS(FINGERPRINTS/LUMINOL)

MORE ENERGY THAN VISIBLE LIGHT THEREFORE MORE EXPOSURE=DANGER

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INFRA RED

SIGNAL

REMOTE CONTROLS SEND SIGNALS USING INFRA-RED

HEATING FOOD

KEEPS FOOD WARM

THERMAL IMAGING

NIGHT VISION, DETECTS HEAT ESCAPING FROM DIFFERENT PLACES

  FIBRE OPTICS  

BROADBAND AND COMMUNICATIONS (CARRIES LOTS OF INFO)



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MICROWAVES

USED TO HEAT FOODS

SHOULDNT BE EXPOSED TO MICROWAVES BECAUSE THEY HEAT WATER IN CELLS

MICROWAVES TURN OFF WHEN YOU OPEN THEM (STOPS EXPOSURE)

METALS REFLECT THE MICROWAVES (WAVES HAVE NOWHERE TO GO COULD START FIRE)

HAVE GAUZES ON DOORS TO PREVENT THE WAVES GETTING THROUGH

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RADIO AND TV WAVES

LONGEST WAVELENGTH

LOWEST FREQUENCY

HIGH FREQUENCY RADIO WAVES ARE ABSORBED BY THE ATMOSPHERE

1901 GUGELIEMO MARCONI SENT SIGNALS ACROOS ATLANTIC

RADIO WAVES CAN AFFECT EACHOTHER (INTERFERNCE) HENCE NO MOBILES ON PLANES

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