192. The speed of propagation of a transverse wave on a string is $100\,\dfrac{\text{m}}{\text{s}}$. This wave has a wavelength of $0.5$ meters and an amplitude of 2 millimeters on the string. If the $x$-axis is along the string and the wave propagates in the direction opposite to the $x$-axis, what is the wave function in SI units?
(1) $u_x = 2\times10^{-3}(120\pi t - 6\pi y)$ (2) $u_y = 2\times10^{-3}(400\pi t - 4\pi x)$ (3) $u_x = 2\times10^{-3}(120\pi t + 6\pi y)$ (4) $u_y = 2\times10^{-3}(400\pi t + 4\pi x)$
\textbf{192.} The speed of propagation of a transverse wave on a string is $100\,\dfrac{\text{m}}{\text{s}}$. This wave has a wavelength of $0.5$ meters and an amplitude of 2 millimeters on the string. If the $x$-axis is along the string and the wave propagates in the direction opposite to the $x$-axis, what is the wave function in SI units?
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(1) $u_x = 2\times10^{-3}(120\pi t - 6\pi y)$ \hfill (2) $u_y = 2\times10^{-3}(400\pi t - 4\pi x)$
(3) $u_x = 2\times10^{-3}(120\pi t + 6\pi y)$ \hfill (4) $u_y = 2\times10^{-3}(400\pi t + 4\pi x)$
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