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Interference
Interference is the overlap of waves; in-phase waves constructively reinforce and out-of-phase waves destructively cancel.
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Interference
Recommended for Class 10
Interference
Interference occurs when two or more waves overlap and combine.
The combined displacement is determined by the principle of superposition.
Constructive Interference
When waves meet in phase, their displacements reinforce.
This gives a larger resultant amplitude.
Destructive Interference
When waves meet out of phase, their displacements oppose one another.
This gives a smaller resultant amplitude and may produce complete cancellation if the waves are equal and opposite.
Interference — Advanced
Common Mistakes
Common Mistakes
- Mistake
Waves do not permanently destroy one another after interference.
- Mistake
After overlapping, they continue travelling.
Revision Zone
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Quick cues from this topic — use them for last-minute revision.
In phase → constructive
Out of phase → destructive
- Definition
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Practice
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Q1. Define interference.
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Q2. Define constructive interference.
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Q3. Define destructive interference.
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Q4. Define superposition.
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Q5. Explain post-overlap behaviour.
Exam Practice
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Q1. Define interference.
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Q2. Define constructive interference.
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Q3. Define destructive interference.
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Q4. State superposition.
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Q5. Explain post-overlap behaviour.
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.