A 128 cm tube is a commonly used length for studying longest wavelengths in acoustics and other physical phenomena. This length has been found to produce the clearest and most accurate results for measuring the longest wavelengths.
The fact that the tube is open at both ends allows for the wave to travel freely in both directions, resulting in a standing wave pattern. This allows for the measurement of the longest wavelength, which is the distance between two adjacent nodes in the standing wave pattern.
Yes, the tube can be open at only one end and still produce a standing wave pattern. However, the measurement of the longest wavelength will be slightly different as it will be the distance between the open end and the first node of the standing wave.
The accuracy of measuring longest wavelengths can be affected by the temperature and humidity of the environment, as well as the quality and composition of the tube material. The presence of any obstructions or irregularities in the tube can also affect the results.
The data obtained from measuring longest wavelengths can be used to study various physical phenomena, such as sound waves, light waves, and even ocean waves. This data can also be used to understand the properties of different materials and their interactions with waves.