LOUISVILLE, Ky. (WAVE) - The sun is always shining bright, regardless if clouds obstruct our view or not. The Earth’s surface sometimes absorbs sunlight, while other times it reflects it. The National ...

DURHAM, N.C. -- Researchers at Duke University and Aalto University (Finland) have constructed a "meta-mirror" device capable of perfectly reflecting sound waves in any direction. The ...

We saw earlier that when sound waves come from correlated sources then their pressure and associated velocity components simply add. This meant that the pressure amplitude could vary between zero and ...

THE method of studying the ionized regions of the upper atmosphere by emitting small pulses of electric waves and recording the echoes reflected from the ionosphere is now well-known and is in ...