Intro Flashcards
energy
the capacity of a system for doing work
5 forms of energy
electromagnetic thermal electrical sound mechanical
transfers energy into or out of biological tissues
therapeutic modalities
radiation is the primary transfer of energy
electromagnetic
distance between peaks on wave
wavelength
number of wave oscillations or vibrations
frequency
lower frequencies equals
longer wavelengths
range of colors
spectrum
when light changes direction as a result of differences in wavelength and frequency of color
refracted
rays that rebound off material
reflected
ray passes through one material to another and changes its path
refraction
rays that pass through material
transmitted
portion of radiation absorbed into material
absorption
no changes can occur in body tissues if the amount of energy absorbed is insufficient to stimulate the absorbing tissues
Arndt-Schultz Principle
inverse relationship between energy absorption by a tissue and energy penetration to deeper layers
Law of Grotthus-Draper