Beat
Periodic and Repeating fluctuations heard in the intensity of a sound waves of very similar frequencies interfere with one another.
Can be caused at antinodes.
Consonance
A combination of two different pleasant pitches.
Constructive Interference
This is caused by superposition of waves with displacements in the same direction that amplify each other.
Decibel
The unit of measurement for sound.
Destructive Interference
This is caused by the superposition of waves with opposite amplitude that cancel each other out.
Dissonance
An unpleasant set of pitches.
Doppler Effect
The apparent change in frequency of a wave caused by the relative motion between the wave's source and the observer.
EX: Ambulance
Doppler Shift
a change in frequency due to the Doppler effect.
Illuminated Source
An object that becomes visible as a result of the light reflecting off it.
EX: Moon
Interference
...
Longitudinal Wave
Parallel to the direction of motion of the wave.
EX: Sound
Luminous Flux
The rate at which light energy is emitted form a luminous source.
Luminous Source
An object that emits light.
EX: Sun
Opaque
A material that transmits no incident light
Polarized
...
Ray Model of Light
Light in which is represented as a ray that travels in a straight path, the direction of which can be changed only by placing an obstruction in the path.
Sound Wave
A pressure variation that is transmitted through matter is a sound wave.
Translucent
A material transmits light, but objects can't be seen clearly
through it.
Transparent
A material that transmits light clearly
Wave
Any rhythmic disturbance that carries energy through matter or space.
Wave Pulse
A single bump or disturbance that travels through a medium.
Frequency
Number of oscillations in pressure each second
Wavelenght
the distance between successive regions of high or low pressure
The speed of sound in air depends on
Temperature
Active Sonar
acoustic signal sent out and sound bounces back if objects are in the path of the waves
Passive Sonar
A receiver used to listen to sound made by vessels and marine life
Amplitude
The measure of the variation in pressure along a wave
Loudness, depends primarily on the ______ of the pressure wave
Amplitude
Light can also be studied using the ______ model or the _____ model
wave, particle
Illuminance
the rate at which light strikes the surface
Light Year
the distance that light can travel in one year. 9.62 x 10^12
Visible Light is a form of _____
EM Radiation