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GATE 2021 BM – Question 38

Engineering Mathematics · Differential Equations · 2 marks · Multiple choice

Solve $\partial y/\partial t+5\partial y/\partial x=0$ with y(x,0)=sin x for all real x, and evaluate y at x=π,t=π/6.

  1. 1
  2. 2
  3. 0
  4. 0.5

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Correct answer: (D) 0.5

Explanation

The transport equation translates its initial profile at speed five: y(x,t)=sin(x−5t). At x=π,t=π/6 the argument is π−5π/6=π/6, so y=sin(π/6)=.5, D. Substitution verifies both the PDE and the initial condition.

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