• # question_answer 29) A cylindrical tube partially filled with water is in resonance with a tuning fork when height of air column is 0.1 m. When the level of water is lowered, the resonance is again observed at 0.35 m. The end correction is: A)  0.025 m                     B)  0.015 mC)  0.001 m                      D)  0.002 m

For first resonance ${{\ell }_{1}}+e=\lambda /4$ Where e is the end correction For second resonance${{\ell }_{2}}+e=\frac{3\lambda }{4}$ So, $e=\frac{{{\ell }_{2}}-3{{\ell }_{1}}}{2}=0.025\,m.$ Hence, the correction option is [a].