Question

Choose the correct snapshot graph of the string at time t = 1.25 s. Review Constants Periodic Table (Figure 1) is a snapshot graph at t 0 s of a pulse on a string moving to the right at 1 m/s. The string is fixed at -3 m (cm) 2A Figure 〈 1 of 1 〉 2 2A y (cm) at t0 1 m/s Fixed end 0 x (m) y (cm) -A 0 x (m) 2

Answer 1

As the string is fixed at x 3, there will be phase change on reflection As after 1.25s, the distance traveled by the pulse is 1.25 m, hence, 0.25 m length of the pulse is reflected with a phase change of 180° Hence, the part of the pulse reflected is superimposed with the remaining part of the pulse giving rise to zero amplitude. Hence, between 2.75 m and 3.00 m, the amplitude of the pulse is zero. And the amplitude of pulse between 2.25 and 2.75 is A. Hence, the correct graph will be of 4th option