Sonic boom is produced when a source of sound travels at a speed:

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  1. greater than the speed of sound.
  2. greater than the speed of light.
  3. lesser than the speed of sound. 
  4. equal to the speed of sound.

Answer (Detailed Solution Below)

Option 1 : greater than the speed of sound.
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The correct answer is greater than the speed of sound.

Key Points

  • When a source of sound travels faster than the speed of sound, a shock wave is generated which gives rise to a sonic boom.
    • These shock waves carry with them a huge amount of energy and pressure difference and those waves create a very loud and strong sound which is called sonic boom.
    • It generates huge amounts of sound energy. It almost feels like the sound of thunder.
    • The shock wave creates a cone of pressurized air molecules. As the cone spreads across the landscape along the flight path, it produces a continuous sonic boom along the entire width of the cone's base.
    • The rapid release of pressure following the build-up by the shock wave is heard as a sonic boom.
    • It is the sudden change in pressure (rate of change) that makes the sonic boom audible.
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