One of the places in a wave where the wave is highest or the disturbance is greatest.
What is the crest?
100
Term that refers to how high or low sound frequencies appear to be.
What is pitch?
100
In the particle model of electromgnetic radiation, particle that travels only the the speed of light and whose energy is related to the frequency of the ardiation in the wave model.
What is photon?
100
The aligning of vibrations in a transverse wave, usually by filtering out waves of other directions.
What is polarization?
100
The SI unit of frequency. On (Hz) is one vibration per second.
What is hertz?
200
One of the places in a wave where the wave is lowest, or the disturbance is greatest, in the opposite direction from a crest.
What is the trough?
200
A disturbance in air (or matter) in which the pressure is lowered. Opposite of compression.
What is rarefaction?
200
The darker part of a shadow where all the light is blocked.
What is umbra?
200
Term applied to materials that absorb light without reemission, and consequently do not allow light though them.
What is opaque?
200
The change in frequency of a wave due to the motion of the source or of the receiver.
What is the Doppler effect?
300
The distance from the midpoint to the maximum (crest) of a wave or, equivalently, from the midpoint to the minimum (trough).
What is amplitude?
300
A frequency at which an elastic object, once energized, will vibrate. Minimum energy is required to continue vibration at that frequency. Also called resonant frequency.
What is natural frequency?
300
For sunlight and other white light, the spread of colors seen when the light is passed through a prism or diffraction grating. In general, the spread of radiation by frequency, so that each frequency appears at a different position.
What is a spectrum?
300
Persistence of a sound, as in an echo, due to multiple reflections.
What is reverberation?
300
The Voice of the People.
What is Vox Populi?
400
A wave in which the vibration is in the same direction as that in which the wave is traveling, rather than at right angles to it.
What is a longitudinal wave?
400
A phenomenon that occurs when the frequency of forced vibrations on an object matches the object's natural frequency, and a dramatic increase in amplitude results.
What is resonance?
400
Electromagnetic waves of frequencies lower than the red of visible light.
What is infrared?
400
An oscillation or repeating back-and-forth motion, about equilibrium position. The source of all sound waves.
What is vibration?
400
Flaps is wings at 225 flaps per second and produces a pitched sound of 225 Hz.
What is a honey-bee?
500
A wave with vibration at right angles to the direction the wave is traveling.
What is a transverse wave?
500
A throbbing variation in the loudness of sound caused by interference when two tones of slightly different frequencies are sounded together.
What are beats?
500
Electromagnectic waves of frequencies higher than those of violet light.
What is ultraviolet?
500
Term applied to sound pitch too low to be heard by the human ear, that is below 20 hertz.
What is infrasonic?
500
_________ can travel through gases, liquids, nd solids, but not through a vacuum.