A plane wave is represented by x=1.2sin(314t+12.56y)

Where x and y are distances measured along in x and y direction in meters and t is time in seconds. This wave has 

(1) A wavelength of 0.25 m and travels in + ve x direction

(2) A wavelength of 0.25 m and travels in + ve y direction

(3) A wavelength of 0.5 m and travels in – ve y direction

(4) A wavelength of 0.5 m and travels in – ve x direction

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