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6thGr:CH 20 Waves
Ch. 20: The Energy of Waves
Question | Answer |
---|---|
wave | is any disturbance that transmits energy through matter or empty space. |
medium | is a substance through which a wave can travel. Examples are solid, liquid, or gas. |
mechanical waves | are waves that need a medium. Example: sound and ocean waves. |
electromagnetic waves | can transfer energy without going through a medium. Example: visible light, mircowaves, tv & radio signals, and x-rays. |
transverse wave | are waves in which the particles of a medium vibrate in an up-and-down motion. |
longitudinal waves | are waves in whcih the particles of a medium vibrate back and forth along the path that the waves move. |
amplitude | is the maximum distance that the particles of a medium vibrate from thier rest position. |
wavelength | is the distance from any point on a wave to an identical point on the next wave. |
frequency | is the number of waves produced in a given amount of time. |
wave speed | is the speed at which a wave travels. |
reflection | happens when a wave bounces back after hitting a barrier. |
refraction | is the bending of a wave as the wave passes from one medium to another at an angle. |
diffraction | is a change of a direction of a wave when the wave finds an obstacle or an edge, such as an opening. |
interference | is the combination of two or more waves that results in a single wave. |
standing wave | is a pattern of vibration that stimulates a wave that is standing still. |
resonance | is a phenomenon that occurs when two objects naturally vibrates at the same frequence, the sound produced by one object causes the other object to vibrate. |