Ultrasonic,infrasonic,and audible waves travel through a medium with speeds $V_u$,$V_i$,and $V_a$ respectively. Then:

  • A
    $V_u$,$V_i$,and $V_a$ are nearly equal.
  • B
    $V_u \ge V_a \ge V_i$
  • C
    $V_u \le V_a \le V_i$
  • D
    $V_a \le V_u$ and $V_u \approx V_i$

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