Mastery A snapshot graph of a wave pulse moving to the right at 1 m/s is shown below. At x = 7m, the wave pulse encounters an open end (loose end) from which it reflects without losing energy as shown in figure (i). On figure (ii) draw a snapshot graph of the string when t = 4s. Dy (m) 3- t = 0 s (i) 2+ c = 1 m/s 1 2 3 4 5 6 7 x (m) Dy (m) 5+ (ii) 4 t = 4s 3+ 1 2 3 456 x (m) lavo