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A plane undamped harmonic wave progates...

A plane undamped harmonic wave progates in a medium. Find the mean space density of energy becomes equal to `W_(0)` at an instant `t=t(0)+T//6`, where `t_(0)` is the instant when amplitude is maximum at this location and T is the time period of oscillation.

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To solve the problem step by step, we need to analyze the energy density of a plane undamped harmonic wave at a specific time. ### Step 1: Understand the Wave Equation The equation of a plane wave can be expressed as: \[ y(x, t) = A \cos(\omega t - kx) \] where: - \( A \) is the amplitude of the wave, - \( \omega \) is the angular frequency, ...
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