Do the long pipes on an organ make a higher note than shorter ones?

The opposite is true. The longer pipes on an organ make lower notes than shorter ones. This is because the frequency of a sound wave is inversely proportional to the wavelength of the wave. In other words, the longer the wavelength, the lower the frequency. The pipes on an organ are essentially tubes that are open at one end. The longer the tube, the longer the wavelength of the sound wave that it will produce. This is why the longest pipes on an organ produce the lowest notes.