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.

Time reflections, or spatial reflections, occur when "electromagnetic radiation in the form of light or sound waves hit a mirror or wall, respectively," resulting in a reflection, like a mirror ...

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

Scientists from ETH Zürich developed a circulator device that uses self-sustaining oscillations to propagate sound waves in ...

Figure 16.1: Of the many reflections of sound in a small room, the direct wave arrives first and establishes the receiver's sense of the direction of arrival of the sound. Later reflections do not ...