In dispersive media, their phase and group velocities may differ, and in moving media they undergo the (*) Doppler effect.
The equation governing these phenomena can usually be written as the d'Alembertian of a field being equal to zero, and "packets" of these phenomena obey the Fourier uncertainty principle. In dispersive media, their phase and group velocities may differ, and in moving media they undergo the (*) Doppler effect. Nodes and antinodes are seen in their "standing" variety, and depending on their mode of propagation, they may be longitudinal or transverse. Traveling ones move at a speed equal to the product of their namesake length and their frequency. For 10 points, name these phenomena, such as light or sound.
The equation governing these phenomena can usually be written as the d'Alembertian of a field being equal to zero, and "packets" of these phenomena obey the Fourier uncertainty principle.
waves (accept electromagnetic waves before "nodes" is read)