Question

What is a plane wave physics?

Answer 1

1. A plane wave is parallel to the direction of propagation of the wave and whose wave fronts are infinite parallel planes.
2. These waves are plane and not spherical with increasing radius
3. In plane-wave disturbances propagated in a single direction like string waves.
4. A plane wave propagating along the direction specified by k and $k=\frac{w}{c}$
5. Plane waves are satisfying wave equations in homogeneous media, therefore plane waves are said to be free-space modes.