Multiple choice

The solution of the differential equation K2 $\frac{d^2y}{dx^2}$ = y – y2 under the boundary conditions (i) y = y1 at x = 0 and (ii) y = y2 at x = $\infty$, where k, y1 and y2 are constants, is

  1. y = (y1 – y2) exp (– x/k2) + y2

  2. y = (y2 – y1) exp (– x/k) + y1

  3. y = (y1 – y2) sinh (– x/k) + y1

  4. y = (y1 – y2) exp (– x/k) + y2

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation