The effect that happens when two pulses overlap to each other.

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Chapter 17.1, Problem 17.1QQ

To determine

The effect that happens when two pulses overlap to each other.

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Two pulses move in opposite directions on a string and are identical in shape and size except that one has positive displacements of the elements of the string and the other has negative displacements. At the moment the two pulses completely overlap on the string, what happens? (a) The energyassociated with the pulses has disappeared. (b) The string is not moving. (c) The string forms a straight line. (d) The pulses have vanished and will not reappear.

Two pulses move in opposite directions on a string and are identical in shape except that one has positive displacements of the elements of the string and the other has negative displacements. Which of the following is true at the moment that the two pulses completely overlap on the string? The string is not moving.The string forms a straight line. The pulses have vanished and will not reappear.The energy associated with the pulses has disappeared.

The amplitudes and phase differences for four pairs of waves of equal wavelengths are (a) 2 mm, 6 mm, and p rad; (b) 3 mm, 5 mm, and p rad; (c) 7 mm, 9 mm, and p rad; (d) 2 mm, 2 mm, and 0 rad. Each pair travels in the same direction along the same string. Without written calculation, rank the four pairs according to the amplitude of their resultant wave, greatest first. (Hint: Construct phasor diagrams.)