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For the plane wave y=2.5xx10^(-0.02x)cos...

For the plane wave `y=2.5xx10^(-0.02x)cos(800t-0.82x+pi/2)`, write down
(i) the general expression for phase `phi`
(ii) the phase at x=0, t=0
(iii) the phase different between the point separated by 20 cm along x-axis.
(iv) the change in phase at a given place 0.6 milli second and
(v) the amplitude at x=100m.
Take units of y,t,x as `10^(-5)cm`, s and m respectively.

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