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Which arrow best shows the direction of the movement of point A on the rope? B. Questions 36-39: A snapshot of a wave with frequency 50 Hz is shown below. 1.5 m 0.20 m 36. What is the amplitude of the wave? A. 0.20 m B. 0.40m C. none of the above 38. What is the wavelength of the wave? A. 1.5 m B. 0.75m C. 0.60m D. 0.50m E. none of the above 39. what is the wave speed? A. 12 m/s B. 18 m/s C. 25 m/s D. 30 m/s E. none of the above 40. The SI unit of magnetic field is A. gauss B. weber C. Tesler D. Tesla E. none of the above 41. Moving charges produce A. an electric field only B. magnetic field only C. both an electric and a magnetic field D. none of the above