A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x-axis with a speed of 128 m/s and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is

1. A. y=(0.02) m (7.58x-1005 t)
2. B. y=(0.02) m (7.85x+1005 t)
3. C. y=(0.02) m (15.7x-2010 t)
4. D. y=(0.02) m (15.7x+2010 t)

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