A wave is represented by the equation
y=Asin(10πx+15πt+3π)
where x is in meters and t is in seconds. The expression represents :
a. a wave travelling in the positive x -direction with a velocity 1.5 m/s.
b. a wave traveling in the negative x -direction with a velocity 1.5 m/s.
c. a wave travelling in the negative x -direction having a wavelength 0.2 m.
d. a wave travelling in the positive x -direction having a wavelength 0.2 m.