Standing Waves Introduction (11:32)
Reflection with and without inversion caused by fixed and free ends are demonstrated. Standing wave patterns at 5 different frequencies are demonstrated. A standing wave animation is shown to understand to how standing wave patterns are created. Nodes and antinodes are defined and demonstrated.
This is an AP Physics 1 Topic.
0:02 Reflection with inversion due to a fixed end
0:29 Reflection without inversion due to a free end
1:00 The demonstration at 15 Hz
1:37 Why the Liquid Crystal Display (LCD) is flashing
2:16 The demonstration at 30 Hz
3:21 The 15, 30, and 45 Hz demonstrations all together
4:12 “Plucking” the string to visualize the wave pulses
4:40 The standing wave animation
7:39 Defining nodes and antinodes using the animation
8:15 Identifying nodes and antinodes in the demonstrations
9:36 Standing wave patterns only work at certain wavelengths