Hi all, my high school physics class has been concerned with waves for some time now. Hoever, we've only considered waves/pulses in strings and cprings, solid mediums anyways. Our textbook has an advanced problem section that asks a bunch about waves in liquid and gaseous mediums--such as a dolphin using sonar in water, sending an echo, which will return. Or sound waves in air. I'm really confused how to approach these problems. Another problem is guitar strings, when they give me the mass and or volume to solve for the wavelength, wavespeed, frequency, and time to reflect... There has to be some relation between density, tension, and waves/pulses. Can anyone point me in the right direction. *If any one can suggest a practice problem and show me how to solve it (a rather hard one plz) I'd much appreciate it. I really have no idea what's going on in physics anymore, all help will eb appreciated!