6. The wave profile in Figure 15 shows several particles at t = 0. The wave has a time period of 8 seconds. (a) What is the wavelength of this wave in meters? (b) What is the frequency of this wave? (c) What is the phase difference in degrees between points D and E? What is the phase difference in radians between points E and F? (d) The wave is moving from right to left. What is the direction of velocity of point D on the wave at t = 0? (e) What is the displacement of the point D at t = 2 s? (f) What is the displacement of the point C at t = 18 s?

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