How do you calculate wavelength with distance? i know that it's 4l for the first harmonic of a closed end column but what is it for an open ended column or a column with one end open, one end closed? why does it work like that?

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a. m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?

Which boundary is associated with the building of the himalaya mountains? convergent transform divergent hot spot

True or false graphs must include scales that increase by the same amount