The study of underwater sound propagation modelling is crucial for advancing the understanding of acoustic behaviour in complex marine environments. Researchers use an array of numerical ...

So far we have only considered sound in isolation and we have seen that sound has velocity, frequency, wavelength and reduces in intensity in proportion to the square of the distance from the source.

Ultrasound scans could soon be much more detailed, thanks to a novel material that can bend sound waves the “wrong” way. This property, known as negative refraction, means the material should bring ...