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X-Rays in Medicine:
-Used for medical diagnosis
-HIGH FREQUENCY SHORTWAVELENGTH ELECTROMAGNETIC WAVES
-Transmitted through healthy tissue Absorbed by bones (denser material)
-Diagnose bone fractures or dental problems
-Can be formed electronically using charge couple device CCD's
CCD's:
-Small silicone chips divided into grid of millions of identical pixels which detect X-Rays and produce electronic systems used for high resolution
images
CT Scans: Computerised Axial Technology
-Use X-Rays to produce high resolution images of soft and hard tissue
-Patient is put into a cylindrical scanner, then…read more

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Ultrasound: A sound wave with a HIGHER FREQUENCY than we can hear
-Electrical systems can be made to produce electrical oscillations of any frequency, these can then be turned into mechanical vibrations; creating
sound waves of a higher frequency than the upper limit of human hearing
Ultrasound Waves can get PARTIALLY REFLECTED :
-When a wave passes form one MEDIUM into another some is REFLECTED off the boundary between the two media while some is TRANSMITTED or
REFRACTED
-So when an ULTRASOUND PULSE passes the…read more

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Can be used to investigate blood flow, diagnose heart problems and check fetal development
Breaking Down Kidney Stones:
-Kidney stones Hard masses that block the urine tact
-A ultrasound beam is concentrates high energy waves at the stones Stone turn to sand and pass out urine
-Advantages are that's its pain and surgery free
Pre-Natal Scanning of a Fetus:
-When ultrasound waves pass through a boundary of two mediums (womb fluid and fetus skin) some waves are reflected back
-Timing and distribution of the waves…read more

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Refractive Index: of a medium is the ratio of speed of light in a vacuum to speed of light in that medium. All transparent materials have a refractive
index.…read more

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An incident ray passing through the focal point refracts through the lens and travels parallel to the axis
3)An incident ray travelling along the axis carries on in the same direction…read more

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Concave Diverging Lenses:
-Causes parallel rays of light to DIVERGE (SPREAD OUT)
-The FOCAL POINT of a diverging lens is WHERE ALL THE RAYS OF LIGHT APPEAR TO BE COMING FROM ALONG THE AXIS BEHIND THE LENS
The 3 Rules about Refraction in a Concave Lens:
1) An incident ray parallel to the axis refracts through the lens and travels in line with the focal point
2)An incident ray passing through the lens towards the principal focus refracts through the lens and travels parallel to…read more

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Ray Diagrams for DIVERGING LENSES:…read more

Comments

cherrypoo

Thanks - these notes are a great help! 5 stars!

Mariam

@cherrypoo Thats great to hear -Your welcome and thanks for the awesome rating

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