The equation of the stationary wave is \( y=2 a \sin (2 \pi c t / \lambda) \) \( \cos (2 \pi x /...

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Counter-Strike: Source
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Counter-Strike: Source (2004)
Duration: 3:29
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The equation of the stationary wave is \( y=2 a \sin (2 \pi c t / \lambda) \) \( \cos (2 \pi x / \lambda) \), which of the following statements is wrong?
(A) The unit of \( c t \) is same as that of \( \lambda \).
(B) The unit of \( x \) is same as that of \( \lambda \).
(C) The unit of \( 2 \pi c / \lambda \) is same as that of \( 2 \pi x / \lambda t \).
(D) The unit of \( c / \lambda \) is same as that of \( x / \lambda \).
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