By convention, that's said to be the direction of the E field.
Longitudinal waves doesn't exhibit polarization or diffraction; these to features are for transverse waves.
The phenomenon that sound wave fails to exhibit is polarization.
polarization
it explains d wave nature of light.
Polarization and Interference confirm light is a wave.
Here is Wikipedias definition:In electrodynamics, circular polarization of an electromagnetic wave is a polarization where the tip of the electric field vector, at a fixed point in space, describes a circle as time progresses. If the wave is frozen in time the electric field vectors describe a helix along the direction of propagation. Circular polarization is a limiting case of the more general condition of elliptical polarization.
Relaxed
That is correct. Polarization is possible only when the direction of vibration is perpendicular to the direction of the wave travel, such is in light. In sound waves, the direction of vibration (compression) is the same direction as the direction of the travel of the sound wave, and therefore polarization is not possible.
electromagnetic wave is not a sound wave
polarization of wave means to allow in one particular direction either it may be a horizontal or vertical and block other direction
em wave is generated by photons which emitter the energy in the form of light
Reflective Polarization from a surface.