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A travelling wave is partly reflected and partly transmitted from a rigid boundary. Let $a_i, a_r$ and $a_t$ be the amplitude of incident wave, reflected wave and transmitted wave and $I_i, I_r$ and $I_t$ be the corresponding intensities. Then choose the correct alternatives
  • A$\frac{{{I_i}}}{{{I_r}}} = {\left( {\frac{{{a_i}}}{{{a_r}}}} \right)^2}$
  • B$\frac{{{I_i}}}{{{I_r}}} = {\left( {\frac{{{a_i}}}{{{a_t}}}} \right)^2}$
  • C$\frac{{{I_r}}}{{{I_t}}} = {\left( {\frac{{{a_r}}}{{{a_t}}}} \right)^2}$
  • D
    All of these
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