Ω t constant y x dy v dt v y z dk ½ µ dx ω 2 a 2

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ω t ) constant y x dy v dt = = v y z dK = ½ ( µ dx ) ω 2 A 2 cos 2 ( kx ω t ) z Integrating over all the elements, the total kinetic energy in one wavelength is K λ = dK = ½ ( µ dx ) ω 2 A 2 cos 2 ( kx ω t ) = ¼ µω 2 A 2 λ x x+ λ x x+ λ
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