chap 10 sciencee

Vibrate

to move rapidly back and forth.

sound wave

a wave produced by vibrations .

intensity

the strength of a sound

decibel

a unit that measures the intensity of sound.

volume

the loudness or softness of a sound

pitch

how high or low sound is

frequency

the number of vibrations per sound of a sound wave

cycle

the complete back and forth motion of a vibration

hertz hz

the unit used to measure frequency of a sound on hertz equals one cycle per second

reflect

to bounce back

echo

a sound that is reflected to its source

sonar

a method of using sound to measure distances under water

ultrasound

a technique that uses sound waves to study organs inside the human body

light

a form of energy that can be seen

photons

small bundles of energy that make up light

visible spectrum

the band of colors that make up white light the colors in rainbow

prism

a clear piece of class or plastic that is shaped like a triangle it can be used to separate white light

image

a copy or likeness

plane mirror

a flat smooth mirror

conwave mirror

a mirror that carves in at the middle

focal point

the point where reflected light rays from a conwave mirror come together in front of the mirror

convex mirror

a mirror that curves outward at the middle

refraction

the bending of a light wave as it movesfrom one material to another

lens

a curved peice of clear material that refracts light waves

convex lens

a lens that is thick in the middle and thin at the edges

nearsighted

able to see objects that are close up clearly

farsighted

able to see objects at a distance clearly