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8th Chap 15 & 16
Characteristics of Waves and Sound
| Question | Answer |
|---|---|
| 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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