N = Sin i/ Sin r (i=angle of incidence, r=angle of refraction/reflection)
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What is refraction?
A change in the direction of a light ray that happens when it changes from one medium to another.
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What do rays of light that meet at 90 degrees do?
Continue into the material without a change of direction.
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What are Endoscopes used for and what do they make use of?
To look inside a body and allow key-hole surgery. They use optical fibres.
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What is Ultrasound?
A sound with a frequency above 20,000 Hertz that can travel through tissue without causing any damage. The sound is reflected when theres a change in speed of the waves.
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Current in X-Ray tubes
Current (Amps) = Number of particles (1/s) x Charge carried by each electron (Coulomb)
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What is the charge of an electron?
1.6 x 10 (−19) Coulombs
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Kinetic Energy
Kinetic Energy (joules, j) = 1/2 Mass of Electron (kg) x Velocity of electron (m/s) squared
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Critical Angle
Sin C = 1/n (Refractive Index)
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Other cards in this set
Card 2
Front
What happens when distance from radioactive source increases?
Back
The intensity of radiation decreases.
Card 3
Front
What does short-sighted mean?
Back
Card 4
Front
What does long-sighted mean?
Back
Card 5
Front
What type of lens is used to correct short-sightedness?
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