Wave Interference Video Lessons

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Problem: Two identical pulses are moving in opposite directions along a stretched string that has one fixed end and the other movable, as shown in Figure 1.Above each pulse, a green arrow indicates the direction of motion of the pulse.The two pulses reflect off the boundaries of the string, and at some later time, they pass through the middle of the string and interfere.Below are six different sequences of snapshots taken as the two pulses meet in the middle of the string. Time increases from top to bottom in each sequence. Which sequence correctly represents the displacement of the string as the pulse interfere?

FREE Expert Solution

Let's label the pulses as:

When pulse 1 is reflected from the wall, its shape will be inverted and will move towards the right.

However, after pulse 2 is reflected from the movable spring, its shape will remain the same but move towards the left.

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Problem Details

Two identical pulses are moving in opposite directions along a stretched string that has one fixed end and the other movable, as shown in Figure 1.


Above each pulse, a green arrow indicates the direction of motion of the pulse.
The two pulses reflect off the boundaries of the string, and at some later time, they pass through the middle of the string and interfere.

Below are six different sequences of snapshots taken as the two pulses meet in the middle of the string. Time increases from top to bottom in each sequence. Which sequence correctly represents the displacement of the string as the pulse interfere?

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