Fluctuation is a physical phenomenon of spatially propagated, and the speed of wave propagation is always limited. Fluctuation is usually a behavior that conveys energy by media (the behavior of a group of particles), such as sonic waves, but some fluctuations do not require medium to transfer energy, such as light waves. The velocity of the wave is related to the inertia of the medium, but not to the nature of the wave source. Wave according to the number of vibration sources can be divided into pulse and periodic wave. When the waves are transmitted in a uniform, non-directional medium, the vibrational direction of the medium can be divided into longitudinal and shear waves.
Sympathetic Resonance and Robotic Arm
The robotic arm in this exhibit is provided by Delta Electronics. In accordance to the timetable, the mechanical device will initiate automatically. The robotic arm can perform meticulous movements and pick up objects with precision. It will bring each metronome in turn to the spring area, where its spring will be wound up. Then, it will brush through all metronomes to let them all start oscillating. At first, every metronome will oscillate in a different pace. However, after a short time, all metronomes will reach "sympathetic oscillation," creating a very impressive visual scene and audio effect! Observe how long it takes for the metronomes to go from random oscillation to full sympathetic oscillation. How is it that the metronomes can "communicate with each other" and eventually reach sympathetic oscillation? What is the secret of this exhibit?
The Trace of Waves
The top spring of this exhibit demonstrates the production and travel of the "longitudinal wave" and the low spring that of the "transverse wave." Give the top bar a strong push, you will see uneven but forward-moving longitudinal waves on the spring. If the other end is fixed, what phenomenon will you see when the longitudinal waves from your end hit the fixed end? What changes will occur in the phase of the reflective waves? When visitors push from both ends at the same time, you will see the longitudinal waves from both sides pass through each other. Do any changes occur to the strength and shape of the two groups of longitudinal waves before and after they pass through each other? When the low bar is given a strong push in a horizontal direction, you will see swaying and forward-moving transverse waves on the spring. Repeat the abovementioned one-person and two-person operations, and observe the reflection and penetration of the transverse waves.
Vertical Snake Pendulum
The period of a simple pendulum and the pendulum length is related to a place's acceleration of gravity. In this exhibit, each ball has a different pendulum length, but they are all suspended vertically. Turn the handle to initiate the oscillation of all balls. Because each ball has a different period of oscillation, they will demonstrate different oscillation and wave combination. Operator can take a step back to admire the movement. Think about it. each ball has a fixed oscillation period defined by its pendulum length. Why is it that the wave pattern of the entire snake pendulum keeps changing? This demonstration adopts an artistic approach to express the scientific content!
Horizontal Snake Pendulum
This snake pendulum is consisted of several horizontally suspended balls. Each ball has a different pendulum length, and hence, a different oscillation period. Turn the operation bar in a counterclockwise direction to initiate the oscillation of the snake pendulum. You can observe the changing waves from both sides. Think about this: each ball has a fixed period of oscillation defined by the length of pendulum. How come the wave pattern of the entire snake pendulum still keeps changing?