when you held the tuning fork above the hollow plastic tube, a standing wave of the first harmonic was created inside of it. Explain where the node would be located and where the antinode would be located and explain how you know.
When a tuning fork is held above a hollow plastic tube, a standing wave of the first harmonic is created inside the tube. In this case, the node would be located at the closed end of the tube, and the antinode would be located at the open end of the tube.
This can be explained by understanding how standing waves are formed. A standing wave occurs when two waves of the same frequency traveling in opposite directions interfere with each other. The interference results in specific points along the medium where the displacement of the wave is always zero, called nodes, and points where the displacement is maximum, called antinodes.
In the case of a closed end of the tube, the air particle motion is restricted, and it cannot vibrate or move. Therefore, at the closed end, the displacement of the standing wave is always zero, and it becomes a node.
On the other hand, at the open end of the tube, the air particles are free to vibrate and move. This allows for maximum displacement of the standing wave, making it an antinode.
By understanding the behavior of waves at closed and open ends, we can determine the node and antinode locations inside the hollow plastic tube when a tuning fork is held above it.