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Medical physics

Refraction is caused by waves changing direction

Waves slow down they bend towards the normal
Light enters glass/plastic it slows down
Wave hits boundary at 90 not change direction

Total internal reflection depends on the angle of incidence

Less than critical angle- most light is reflected
Critical angle-…

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Power is the rate of doing work

Power= work done/ time taken

Metabolic rate is the rate in which your body uses energy per sec/ min/day/hour

Basal metabolic rate is the rate you burn energy at rest

Tells you the minimum amount of energy needed to keep your body working…

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Intensity of radiation is the rate of which energy arrives at 1m2 of surface

"Rate of energy" is power so....
Intensity = power/area
Sum it up: intensity of radiation is equal to power of radiation divided by the area it falls on

Intensity of radiation depends on distance from source…

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All the mass of the electron have been converted to energy- E=mc2

(Positron Electron Tomography) PET scanning involves Positron/Electron annihilation

Shows organ or tissue function
Better than x-rays, because x-rays shows only structure
1. Shows area of damage tissue in the heart by detecting areas of decrease flow- reveal coronary…

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