Which of the following best explains why sound waves cannot be polarized whereas light waves can?
(a) Sound waves have much lower frequency than light, so no practical polarizer can interact with them
(b) Light travels faster than sound; polarizing devices function only at such high propagation speeds
(c) Sound waves are longitudinal, so their oscillations are along the direction of propagation and cannot be restricted to one plane
(d) Polarization acts on electric‐field orientations, so only waves that possess changing electric fields—such as light but not sound—can be polarized