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Physics: Must Pass
I have to pass physics.
Question | Answer |
---|---|
standing wave | incident and reflected pulses are created with periodic frequency; appears stationary |
node | point with complete destructive interference (zero energy) |
antinode | largest amplitude; 1/2 way between nodes |
infrasonic | frequencies below 20 Hz |
Ultrasonic | frequencies above 20,000 Hz |
Pitch | measure of how high or low a sound is; frequency of sound wave |
wave fronts | 3-D distribution of waves (a sphere) |
Plane waves | seem like a straight line |
timbre | quality of tone resulting from the combination of harmonics present at different intensities (sound quality) |
chromatic scale | 12 note scale; 13th note is twice 1st notes frequency |
beat | periodic variation in amplitude of sound wave that is the superposition of two waves of slightly different frequencies |
beat frequency | difference in frequencies of two similar sound waves |
amplitude | max displacement from equilibrium |
wave length | distance between identical positions on consecutive waves |
frequency | number of waves passing a fixed point per unit time |
period | time required to complete a cycle |
wave | motion of a disturbance to a medium |
medium | matter through which wave travels |
mechanical waves | one that requires a medium to travel through |
electromagnetic waves | doesn't require a medium |
pulse wave | wave made of one traveling pulse |
periodic wave | wave made of periodic and continuing pulses |
simple harmonic motion | created by continuous pulses (periodic wave); follows rules for sine waves |
transverse wave | wave with vibration perpendicular to direction of wave's motion |
longitudinal wave | wave with vibration parallel to motion of wave (sound) |
sympathetic vibrations | vibration caused by resonance; starts vibrating because of the waves of second object |
resonance | phenomenon that occurs when the frequency of a force applied to a system matches the natural frequency of vibration of the system, resulting in a large amplitude of vibration |
fundamental frequency | lowest frequency of vibration of a standing wave; also called 1st harmonic |
harmonics | fundamental and successive multiples of the fundamental |
intensity | rate at which energy flows through a unit area perpendicular to direction of the waves motion |
threshold of hearing | 1000 Hz |
Threshold of pain | 1.0 W/M^2 |
relative intensity | intensity of wave divided by intensity of threshold of hearing |
decibel level | measure of loudness |
compression | high density/peak |
rarefaction | low density/trough |
wave speed | distance traveled per time |
damping | amplitude of a wave diminishes over time due to energy loss |
super-position | combination of two overlapping waves |
interference | interaction of two waves |
constructive interaction | two waves add in same direction |
destructive interaction | two waves subtract due to a + and - amplitude |
reflection interaction | bouncing back of a wave at a boundary |