A pulse travels through a uniform medium, the speed of the pulse will be

  1. Increasing
  2. Decreasing
  3. Constant
  4. First decrease then constant.

Answer (Detailed Solution Below)

Option 3 : Constant
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Detailed Solution

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CONCEPT:

  • The speed of a wave or a pulse depends upon the properties of the medium.
  • If the medium is uniform or unchanging, then the speed is constant.

\({\rm{v}} = \sqrt {\frac{{{\rm{Elastic\;property}}}}{{{\rm{Inertial\;property}}}}}\)  ⇒ \({\rm{v}} = \sqrt {\frac{{\rm{B}}}{{\rm{\rho }}}}\) ;

Where B is the bulk modulus of medium and ρ is the density of the medium.

  • Bulk modulus: The relative change in the volume of a body produced by a unit compressive or tensile stress acting uniformly over its surface.

F1 Jitendra 6.5.20 Pallavi D3

EXPLANATION:

  • As the medium is uniform, so density is always constant and bulk modulus for every material is fixed.
  • So, the velocity is constant throughout the medium.
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