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Two waves of the same frequency and intensity superimpose each other in opposite phases. After the superposition, the intensity and frequency of waves will

1. increase
2. decrease
3. remain constant
4. become zero

Correct answer: become zero

Solution

When two waves of the same frequency and intensity superimpose in opposite phases, they undergo destructive interference, resulting in a net intensity of zero. The frequency remains unchanged, but the wave effectively cancels out.

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