$A$ transverse wave of amplitude $0.5\, m$,wavelength $1\, m$,and frequency $2\, Hz$ is propagating in a string in the negative $x$-direction. The expression for this wave is:
- A$y(x, t) = 0.5\sin(2\pi x - 4\pi t)$
- B$y(x, t) = 0.5\cos(2\pi x + 4\pi t)$
- C$y(x, t) = 0.5\sin(\pi x - 2\pi t)$
- D$y(x, t) = 0.5\cos(2\pi x + 2\pi t)$
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