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The wave described by $y = 0.25 \: \sin \: ( 10\: \pi x\: -2\: \pi t),$ where x and y are in meters and t in seconds, is a wave travelling along the :

(1) $ -ve\: x$ dirextion with amplitude 0.25 m and wavelength $ \lambda = 0.2 m$

(2) $ - ve\: x$ direction with frequency 1 Hz

(3) $ +ve\: x$ direction with frequency $ \pi$ Hz and wavelength $ \lambda = 0.2 m$

(4) $ +ve\: x$ direction with frequency 1 Hz and wavelength $ \lambda = 0.2 m$

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