Speed of sound in air near room temperature is approximately

  • A
    $3.4 \times 10^2 \text{ m s}^{-1}$
  • B
    $34 \text{ m s}^{-1}$
  • C
    $34 \text{ km s}^{-1}$
  • D
    $3.4 \text{ km s}^{-1}$

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