(left) Frequency dependence of attenuation as ... atmospheric absorption can be neglected except where long distances or very high frequencies are involved. Ref.: Cyril Harris, "Absorption of Sound in ...

Sound waves with very high frequencies are called ultrasound ... A small device called an ultrasound probe is used, which gives off high-frequency sound waves. We can't hear these sound waves ...

Photonic technology can now be used to construct miniature sources of high-frequency radio waves that ... of 'super modes' that appear in the phase noise spectrum. These modes — highly ...

When the sounds have very different energy distributions, or when there is a frequency dependence involved, such as with SOUND INSULATION or other noise control, then an analysis of the frequency ...