Question 15 1 pts Two waves travelling at the same speed. Which statements about the figure below are correct? 1.00 0.75 0.50 0.25 Displacement in cm 0.00 -0.25 -0.50 -0.75 -1.00 5 6 Distance in cm O A has a higher frequency than b. D Amplitude of a is twice the amplitude of b. D Amplitude of a is half the amplitude of b. O A has a lower frequency than b. Double the amplitude of a double the speed it travels. Question 16 1 pts Different points along a wave are shown in figure below. Selected the correct statements. B D Displacement 0 Distance Points A and B, with a separation of one whole wavelength. Points A and B are out of phase. Points C and D have a phase difference of 45. O Points A and B are in phase. Points C and D have a phase difference of 90