An underwater research drone uses both a high-frequency sonar transducer (producing sound waves) and a blue-laser optical system (producing electromagnetic waves) to perform measurements. Which statement correctly describes the behaviour of the waves propagating from these systems through water?
The sound waves are longitudinal and can be polarised to reduce backscatter from suspended particles.
The electromagnetic waves are transverse and can be polarised, whereas the sound waves are longitudinal and cannot be polarised.
The sound waves are transverse waves and travel at a speed determined solely by the refractive index of the water.
The electromagnetic waves are longitudinal waves where the electric field oscillates parallel to the direction of energy propagation.