Question 116Asked in BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam)

Consider the wave equation ∂²u/∂t² = 4 ∂²u/∂x², 0 < x < π, t > 0तरंग समीकरण पर विचार करें:

Consider the wave equation ∂²u/∂t² = 4 ∂²u/∂x², 0 < x < π, t > 0 with u(0, t) = u(π, t) = 0, u(x, 0) = sin x and ∂u/∂t = 0 at t = 0. Then u(π/2, π/2) is
तरंग समीकरण पर विचार करें: ∂²u/∂t² = 4 ∂²u/∂x², 0 < x < π, t > 0 u(0, t) = u(π, t) = 0, u(x, 0) = sin x और t = 0 पर ∂u/∂t = 0 के साथ, तब u(π/2, π/2) है
  1. A22
  2. B11
  3. C−1−1
  4. DMore than one of the aboveउपर्युक्त में से एक से अधिक
  5. ENone of the aboveउपर्युक्त में से कोई नहीं
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Correct answer: (C) −1−1

Explanation

The solution is u = sin x cos 2t (it satisfies the equation and all conditions). At (π/2, π/2) it equals 1 × cos π = −1.हल u = sin x cos 2t है (यह समीकरण और सभी शर्तों को संतुष्ट करता है)। (π/2, π/2) पर इसका मान 1 × cos π = −1 है।

From BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam) — Previous Year Paper

This is question 116 of BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam) — Previous Year Paper. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.