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 ...

and which may be considered as equivalent to stationary sound waves of very high frequency. We have observed and studied numerous examples of this special kind of X-ray reflection, but will ...

4:21 Beneath the waves, the ocean is a world of sound. Marine animals like whales use sound to travel, communicate, and find food underwater. But since humans have introduced machinery ...