Question

# A pulse wave on a string is shown in the figure. P is particle of the string present at midpoint of pulse wave at the instant shown. Then state which of the following are correct. Considering wave moving in right hand direction as positive.

A
If P is stationary point, then pulse consists of two waves travelling in opposite direction
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B
If P is moving upwards, then pulse is travelling in positive direction
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C
If P is moving downwards, then pulse is travelling in negative direction
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D
None of these is incorrect
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Solution

## The correct options are A If P is stationary point, then pulse consists of two waves travelling in opposite direction B If P is moving upwards, then pulse is travelling in positive direction C If P is moving downwards, then pulse is travelling in negative direction Option A: Consider crust as wave-1 and trough as wave-2. If both waves move in opposite directions, then position of point P will be as it is, it will neither move up nor move down. Option B: If the wave moves right side, then P should move upwards. Option C: If the wave moves left side, then P should move downwards.

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