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The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies 9 Hz and 11 Hz, is :

1. t(s) y 0 1 2
2. t(s) y 0 1 2
3. t(s) y 0 1 2
4. t(s) y 0 1 2

Correct answer: t(s) y 0 1 2

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