For a travelling harmonic wave y(x, t)=2.0 2 (10t-0.0080x+0.35) , where x and y are in cm and t in s. The phase difference between oscillatory motion of two points separated by a distance of 0.5 m is:

1. A. 0.08 rad
2. B. 0.008 rad
3. C. 0.8 rad
4. D. 8 rad

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