<p>A prgressive wave in one dimension given by the equation
<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle u(x,t)=A\sin \left({\frac {2\pi }{\lambda }}x-\omega t\right)}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mi>u</mi><mo stretchy="false">(</mo><mi>x</mi><mo>,</mo><mi>t</mi><mo stretchy="false">)</mo><mo>=</mo><mi>A</mi><mi>sin</mi><mo>⁡<!-- ⁡ --></mo><mrow><mo>(</mo><mrow><mrow class="MJX-TeXAtom-ORD"><mfrac><mrow><mn>2</mn><mi>π<!-- π --></mi></mrow><mi>λ<!-- λ --></mi></mfrac></mrow><mi>x</mi><mo>−<!-- − --></mo><mi>ω<!-- ω --></mi><mi>t</mi></mrow><mo>)</mo></mrow></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle u(x,t)=A\sin \left({\frac {2\pi }{\lambda }}x-\omega t\right)}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c130eb5733a5893b5948d180afca4700de38f1c4" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -2.505ex; width:27.634ex; height:6.176ex;" alt="{\displaystyle u(x,t)=A\sin \left({\frac {2\pi }{\lambda }}x-\omega t\right)}"></span>.
where
</p>
<ul><li><i>u</i> is the momentary disturbance</li>
<li><i>λ</i> is the wavelength</li>
<li><i>t</i> is the time</li>
<li><i>ω</i> is the angular frequency = 2<i>πf</i></li>
<li><i>\tau</i> is the period of the wave = 1/<i>f</i></li></ul>
<a href="//commons.wikimedia.org/wiki/User:Inductiveload" title="User:Inductiveload">Inductiveload</a>
2007-06-13
<span class="int-own-work" lang="en">Own work</span>