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| 5893740011 | Mechanical | _______ waves require a material medium for energy transfer | 0 | |
| 5893740012 | Transverse | A _______ wave causes the particles of the medium to vibrate in a direction perpendicular to the direction in which the wave is traveling (90 degrees, trough and crest) | 1 | |
| 5893741814 | Electromagnetic | _______ waves need no medium for travel (can go through vacuum) | 2 | |
| 5893741815 | Wave Pulse | A _______ is a singular disturbance traveling through a medium | 3 | |
| 5893744008 | Frequency | The _______ of a wave is the number of waves that pass through a given point per second Same as pitch, unit: 1/s or Hertz (Hz) | 4 | |
| 5893744009 | Period | The _______ of a wave is the reciprocal of its frequency (time for one cycle) T, unit: seconds | 5 | |
| 5893748054 | Wavelength | The _______ of a wave is the linear distance between any two corresponding points on consecutive waves Unit: lambda | 6 | |
| 5893753286 | Amplitude | The energy content of a mechanical wave is characterized by its _______ (magnitude of max displacement) Height, unit: m | 7 | |
| 5893781156 | Interference | _______ is the process involved when two waves meet and superimpose their amplitudes (meeting of wave) | 8 | |
| 5893781157 | Speed | The _______ of a mechanical wave depends on the medium | 9 | |
| 5893782512 | Longitudinal/Compressional | A sound wave is a _______ wave | 10 | |
| 5893782513 | Standing | A _______ wave is produced when a wave train moving in one direction meets an identical wave moving in the opposite direction (formed by two identical/same characteristics but opposite direction waves) | 11 | |
| 5893782514 | Node | Two pulses with identical shapes but opposite directions move toward each other in a medium. The point in the medium that is never displaced is a _______ | 12 | |
| 5893784352 | Refraction | _______ is the direction change of waves at the boundary between different media (waves enter to second medium with a different angle) Angle of incidence =/= Angle of _______ | 13 | |
| 5893785984 | Diffraction | _______ is the bending of a wave around an obstacle | 14 | |
| 5893824093 | Loudness | Intensity of sound waves Unit: decibel (dB) | 15 | |
| 5893827207 | Echo | Reflection of sound waves in air | 16 | |
| 5893839336 | Infrasound or Infrasonic | Below hearing range | 17 | |
| 5893840962 | Ultrasound or Ultrasonic | Above hearing range | 18 | |
| 5893843239 | Constructive Interference | Amplitude is larger than original ones | 19 | |
| 5893852523 | Destructive Interference | Amplitude is smaller than original ones (can be zero) | 20 | |
| 5893855315 | Superposition | Sum/combination of waves' amplitudes (result of interference) | 21 | |
| 5893874132 | Reflection | Waves turn back to same medium (surface; mirror) Angle of incidence = Angle of _______ | 22 | |
| 5893929406 | Trough | Bottom of a transverse wave | 23 | |
| 5893929407 | Crest | Top of a transverse wave | 24 | |
| 5893929438 | Compression | In a longitudinal/compressional wave, such as with a spring or slinky, where the coils are closest together | 25 | |
| 5893930921 | Rarefaction | In a longitudinal/compressional wave, such as with a spring or slinky, where the coils are farthest apart (few molecules in medium) | 26 | |
| 5893960034 | Equilibrium | Zero level | 27 | |
| 5893977345 | Vibration | A periodical motion between two points; the particles' motion in waves; creates waves | 28 | |
| 5893982439 | Medium | Material | 29 | |
| 5894036667 | Tacoma Narrows Bridge |  | 30 | |
| 5895492573 | Resonance | A dramatic increase of wave amplitude | 31 | |
| 5895496815 | Traveling | Waves where energy moves through a long distance | 32 | |
| 5895499364 | Energy | In waves, _______ is transported (not matter) | 33 | |
| 5895506435 | Simple Harmonic Motion (SHM) | Simplest restoring force and motion that can be described by harmonic functions (sines and cosines) | 34 |
