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8th Chap 15 & 16

Characteristics of Waves and Sound

QuestionAnswer
diffraction the bending of waves around the edge of a barrier
refraction the bending of waves due to a change in speed
wavelength the distance between two corresponding parts of a wave
constructive interference a process in which waves combine to make a wave with larger amplitude
seismic waves waves produced by earthquakes
sound a disturbance that travels through a medium as a longitudinal wave
infrasound sound waves with frequencies below the normal human range of hearing
amplitude the maximum distance that the particles of a medium moves from the rest position
intensity the amount of energy a sound wave carries per second through a unit area
interference the interaction between two waves that met
crests the highest parts of a transverse wave
pitch how high or low a sound seems to a person
mechanical waves are classified according to how they move
longitudinal waves waves that move the particles of the medium parallel to the direction in which the waves are traveling
decibels the units that loudness is measured in
reflection when a wave hits a surface through which it cannot pass and bounces back
standing wave when an incoming wave combines with a reflected wave in such a way that the combined wave appears to be standing still
frequency measured in units called hertz
elasticity the ability of a material to bounce back after being disturbed
wave a disturbance that transfers energy from place to place
resonance when vibrations traveling through an object match the object's natural frequency
a wave travels through a medium because the wave's energy passes from particle to particle
why do you see lightning from a distant storm before you hear thunder light travels faster than sound
why fly at a higher altitude to break the sound barrier the temperature is lower, so the speed of sound is lower
frequency is measured in units called hertz
refraction occurs when a wave enters a new medium at an angle
the speed of sound depends on the properties of the medium it travels through
the Doppler effect the changing of a police car's siren as it moves by you
the pitch of a sound that you hear depends on the sound wave's frequency
when a wave moves through an opening in a barrier it bends and spreads out
you can hear sounds from around corners because of diffraction
the first person to break the sound barrier was Chuck Yeager
mechanical waves are created when a source of energy causes a medium to vibrate
Created by: Mrs. Gordon
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