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A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude ${\rho _0}$ inside the tube. If the atmospheric pressure is ${\rho _A},$ then the ratio of maximum and minimum pressure at the closed end of the tube will be
  • A$\frac{{({\rho _A} + {\rho _0})}}{{({\rho _A} - {\rho _0})}}$
  • B$\frac{{({\rho _A} + 2{\rho _0})}}{{({\rho _A} - 2{\rho _0})}}$
  • C$\frac{{{\rho _A}}}{{{\rho _0}}}$
  • D$\frac{{\left( {{\rho _A} + \frac{1}{2}{\rho _0}} \right)}}{{\left( {{\rho _A} - \frac{1}{2}{\rho _0}} \right)}}$
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