The speed of a wave of time period \( T \) and propagation constant...

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The speed of a wave of time period \( T \) and propagation constant \( K \) is
\( \mathrm{P} \)
(1) \( \frac{2 \pi}{T K} \)
(2) \( \frac{T K}{2 \pi} \)
(3) \( \frac{1}{T K} \)
(4) \( \frac{T}{K} \)
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