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 ${V_u} \approx {V_i}$
Medium
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