Two pulses move with the same speed but in opposite directions along a stretched

Question

Two pulses move with the same speed but in opposite directions along a stretched string that has one end fixed and the other end movable, as shown in the diagrams. The pulses reflect from the boundaries and then interfere. In the six questions below consider the situation after one or two reflections, as appropriate. Answer true, false, or cannot tell; e.g., if the first 4 questions are true, question 5 is false, and question 6 cannot tell, enter TTTTFC. You only have five tries! When two pulses on a string begin to overlap, the resultant wave shape is found using the principle of superposition. The snapshot below could represent the state of the string in diagram 2, after the pulses reflect once. There is a point (apart from the fixed end) on the string in diagram 1 that does not move as the pulses pass by after the first reflection. If the pulses interfere destructively, there is a moment when the string is perfectly straight. At that instant the string has only kinetic energy. The snapshot below could represent the slate of the string in diagram 1, after the pulses reflect once. Destructive interference is discussed in Physics books but does not occur in real life.

Explanation / Answer

It is TTTTTF.

for ii, at rigid boundary there is a chnage in phase while at the other end there is no phase change.

for iii, there are so many points on the string except those through which disturbances are just passing.

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