A transverse wave of amplitude $0.5\, m$ and wavelength $1\, m$ and frequency $2\, Hz$ is propagating in a string in the negative $x-$direction. The expression for this wave is
AIIMS 1980, Easy
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(b) $y = a\cos \left( {\frac{{2\pi }}{\lambda }vt + \frac{{2\pi x}}{\lambda }} \right) = 0.5\cos \left( {4\pi t + 2\pi x} \right)$
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