Unit 7 review Flashcards
Resonance
The prolonging of a sound by the reflection of a surface
Sound waves
A wave of compression and rarefraction
Frequency/pitch
The number of waves that pass a fixed point in a certain amount of time
Amplitude/volume
The distance between the resting point of the wave and the crest of trough
Ultrasound
Sound waves reflect off the organs or tissues and produce electric signals and a computer converts them to a video image
Sonar
Uses sound waves to estimate size, shape, and depth of underwater objects
Electromagnetic spectrum
Arranged by wavelength and frequency
Focus on visible light
Radiant energy, colors visible light
Reflection
When light bounces off a surface
Refraction
Light bends
Diffraction
Light waves hit an obstacle and scatter
Mirrors vs. lenses
Mirrors reflect light
Lenses refract light
Convex mirrors
Produce a small upright image
Ex. Car side mirror
Concave mirrors
Converge light
Magnified image
Convex lenses
Converge light
Ex. Magnifying glass
Concave lenses
Diverge light
Ex. Glasses for nearsightedness
Transmission
Light goes right through another object
Absorption
Light goes into an object
Scattering
Light hits an object and goes in all directions
Do not need a medium
Electromagnetic waves
Need a medium
Mechanical waves
Transverse
Particles move perpendicularly to the wave
Compressional
Particles vibrate parallel to the wave
