Acoustic

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 * Speed:** Distance travelled in unit time (m/s)


 * Frequency:** Number of complete waves in one second (Hz)


 * Wavelength****:** Distance between matching points on the wave (m)


 * Longitudinal:** Vibration parallel to direction of travel


 * Transverse:** Vibration at right angle to direction of travel

About the video:
- Sound is normally caused by objects vibrating

- Is variations in pressure what gives you a sound wave

- When we clap our hands you can see that they vibrate quite a lot, but this is actually the source of noise, you are creating acceleration noise. The air between our hands creates a little compression wave (witch is an acoustic wave, it's what we hear)

- If waves are above of the speed of sound, these waves get bunch together and eventually form a shockwave, witch is the sonic boom your hear