Physics 9702 · AS & A Level · Progressive waves

Progressive waves — practice question

A travelling sound wave in air has amplitude $x_0$ and intensity $I$. If the wave amplitude rises to $3x_0$, what is the wave’s new intensity?

  • A$\frac{I}{9}$
  • B$\frac{I}{3}$
  • C$3I$
  • D$9I$

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