A wave is moving along a string. The equation giving the displacement y of a point at

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Question:

A wave is moving along a string. The equation giving the displacement y of a point at coordinate x and
at time t has the form y = 0.2cos(4pi(x)/5-20pi(t))where the units are in meters and seconds.

i.)Calculate the frequency and the speed(m/s) of the wave.

ii.)By reflecting this wave from rigid support, standing transverse waves are set up on a stretched string. It is observed that the string is vibrating in its SECOND HARMONIC. Calculate the length of this string in meters.