The speed of a body that has Mach number more than 1 is

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NDA (Held On: 23 Apr 2017) General Ability Test Previous Year paper
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  1. Supersonic
  2. Subsonic
  3. 300 m/s
  4. About 10 m/s

Answer (Detailed Solution Below)

Option 1 : Supersonic
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CONCEPT:

  • Shock waves: When an object moves with a velocity greater than that of sound, it is termed as Supersonic.
  • When such a supersonic body or plane travels in air, it produces energetic disturbance that moves in the backward direction and diverges in the form of a cone.
  • Such disturbance is called the shock waves
  • The speed of supersonic is measured in Mach number.
  • One mach number is the speed of sound and it defined as the ratio of the velocity of the source to the velocity of sound i.e.,

\(Mach\;Number = \frac{{Velocity\;of\;source}}{{Velocity\;of\;sound}}\)

EXPLANATION:

So these are the ratios of different speed of the body, for

  • Hypersonic > 5.0 mach
  • Supersonic > 1 mach
  • Subsonic < 1 mach
In our case, only option 1 is true since only for an object traveling at supersonic will have mach greater than 1
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