Sound waves can reflect off surfaces. We hear reflected sound waves as echoes. Hard, smooth surfaces are particularly good at reflecting sound. This is why empty rooms produce lots of echoes.

Similarly, spatial reflections of sound waves form echoes that carry our words back to us in the same order we spoke them. Scientists have hypothesized for over six decades the possibility of ...

The explanation of spatial reflections—whether by light or by sound—are pretty intuitive. Electromagnetic radiation in the ...

in order to avoid unwanted reflections of light or microwaves. Ten years ago, researchers succeeded in suppressing sound wave ...

A quiet revolution is taking shape in the world of physics, and it doesn’t rely on exotic particles or massive particle ...

Earthquakes create ripple effects in Earth's upper atmosphere that can disrupt satellite communications and navigation ...

This is useful when having a conversation, but in some technical applications one would prefer the waves to be able to travel only in one direction – for instance, in order to avoid unwanted ...