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Slide 2

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WAVE MOTION
Transverse
· oscillations perpendicular
to wave travel
Longitudinal
· oscillations parallel to
wave travel…read more

Slide 3

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DEFINITIONS
po
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Slide 4

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WAVE PROPERTIES
Reflection
· the wave is bounced back when it
hits a boundary
Refraction
· the wave changes direction as it
enters a different medium
Diffraction
· the wave bends round the edges of a
narrow gap…read more

Slide 5

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ELECTROMAGNETIC WAVES
Region Wavelength Uses
103 · television signals
Radio waves
· communication
10-2 · heating food
Microwaves
· communication
10-5 · heating
Infra-red · remote controls
· nocturnal wildlife photography
Visible light 4 to 7x10-7 · vision
10-8 · making fluorescent substances glow
Ultraviolet · sun beds
· setting dental glue
10-10 · medical imagery
X-rays
· checking welds
10-12 · sterilising surgical instruments
Gamma rays · killing bacteria in food
· killing cancer cells…read more

Slide 6

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ULTRAVIOLET
UV-A UV-B UV-C
=315-400nm =280-315nm =100-280nm
ionising, causing
absorbed by DNA cell
ages skin
molecules mutation/destru
ction
sunburn and skin
cancer
cancer…read more

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Comments

AmmarAli

2 months of work covered in 10mins. thanks for these!!

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