click below
click below
Normal Size Small Size show me how
Madison Burkhard
Chapter 17&18 Vocab
Question | Answer |
---|---|
mechanical wave | disturbance in matter that carries energy from one place to another. |
medium | material through which a wave travels |
crest | highest point of the wave above the rest position |
trough | lowest point below the rest position |
transverse wave | a wave that causes the medium to vibrate at right angles to the direction in which the wave travels |
compression | an area where the particles in a medium are spaced close together |
rarefaction | an area where the particles in a medium are spaced out |
longitudinal wave | a wave in which the vibration of the medium is parallel to the direction the wave travels |
surface wave | wave that travels along a surface separating two media |
periodic motion | any motion that repeats at regular time intervals |
period | time required for one cycle, a complete motion that returns to its starting point |
frequency | the number of complete cycles in a given time |
hertz | frequency measured in cycles per second |
wavelength | the distance between a point on one wave and the same point on the next cycle of the wave |
amplitude | the maximum displacement of the medium from its rest position |
reflection | occurs when a wave bounces off a surface that it cannot pass through |
refraction | bending of a wave as it enters a new medium at a angle |
diffraction | bending of a wave as it moves around an obstacle or passes through a narrow opening |
interference | occurs when two or more waves overlap and combine together |
constructive interference | occurs when two or more waves combine to produce a wave with a larger displacement |
destructive interference | occurs when two or more waves combine to produce a wave with a smaller displacements |
standing wave | a wave that appears to stay in one place and doesn't move through the medium |
node | a point on a standing wave that has no displacement from its rest position |
antinode | a point where a crest or trough occurs midway between two nodes |
electromagnetic waves | transverse waves consisting of changing electric fields and changing magnetic fields |
electric field | a region of space exerts electric forces on charged particles |
magnetic field | a region of space produces magnetic forces |
electromagnetic radiation | transfer of energy by electromagnetic waves traveling through matter or across space |
photoelectric effect | emission of electrons from a metal caused by light striking the metal |
photons | packets of electromagnetic energy |
intensity | rate at which a wave's energy flows through a given unit of area |