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waves - Coggle Diagram
waves
acoustics
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definition
\(P_\text{total}(x,t)=P_\text{atm}+p(x,t)\)
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plane waves
\(p_\text{real}(x,t)=p\cos(\omega t-kx+\alpha)\)
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harmonic
definition
sinusoidal time-dependence, with an angular frequency ω