wave tranfers

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energy

mechanical waves- need medium

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transverse waves- waves go up and down

longitudinal waves - waves go left to right

sound waves - wave produced by objects that are vibrating. :

refraction -the change in direction of a wave, caused by the change in the wave's speed.

diffraction-bending of light as it passes around the edge of an object.

reflection - he return of light or sound waves from a surface.

electromagnetic waves- doesn't need a medium to travel

decibel- unit for sound waves

frequency - number of waves that pass a fixed point in a given amount of time.

wave speed- speed at which a wave travels.

Doppler effect- increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other.

audible hearing range-commonly stated range of human hearing

intensity- the power transferred per unit area,

ultrasonic( more than 20,000 Hz

infrasonic( less that 20 Hz)

standing waves- vibration of a system in which some particular points remain fixed

harmonics- frequency of an oscillation or wave.

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resonance- phenomenon in which a small-amplitude driving force could produce large-amplitude motion.

interference- combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or canceled.

destructive interference- interference of two waves of equal frequency and opposite phase, resulting in their cancellation

constructive interference- If the amplitudes of two waves have the same sign they will add together to form a wave with a larger amplitude.

wavelength - distance between successive crests of a wave

antinodes- the points that undergo the maximum displacement during each vibrational cycle

nodes- point along a standing wave where the wave has minimum amplitude

Amplitude - the maximum extent of a vibration or oscillation

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