Explain polarisation as a phenomenon of transverse waves and use polarisation to identify wave orientation.
Polarisation is a phenomenon associated with light waves but not with sound waves.
State the meaning of polarisation.
oscillations are in a single direction, which is perpendicular to the direction of propagation (of the wave)
or
oscillations are in a single plane, which contains the direction of propagation (of the wave)
State why light waves can be plane polarised but sound waves cannot.
light waves are transverse and sound waves are longitudinal