A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x-axis with 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

Question

( A ) y = (0.02)m sin (7.58x – 1005 t)
( B ) y = (0.02)m sin (7.85x + 1005 t)
( C ) y = (0.02)m sin (15.7x + 2010 t)
( D ) y = (0.02)m sin (15.7x – 2010 t)