The third resonance of an open-closed organ pipe corresponds to 193 Hz on the chromatic musical scale. What is the length of the pipe? Take sound wave velocity to be 343 m/s
Hint: Third resonance in an open one end closed at the other end instrument corresponds to n=2

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?