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The Mach number is the:
  • A
    EAS divided by the local speed of sound.
  • B
    CAS divided by the local speed of sound.
  • C
    IAS divided by the local speed of sound.
  • D
    TAS divided by the local speed of sound.

One way to express the Mach number is the ratio between the TAS divided by the Local Speed of Sound (LSS):

M = TAS ÷ LSS

Be aware that the question is asking about the MACH NUMBER, not about the indication of a machmeter. The machmeter only displays the ratio between dynamic and static pressure.

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