mindmap root((SON)) sonic 1、 Having to do with sound.
2、 Having to do with the speed of sound in air （about 750 miles per hour）.
🌱A sonic depth finder can easily determine the depth of a lake by bouncing a sound signal off the bottom. 🌳A sonic boom is an explosive sound created by a shock wave formed at the nose of an aircraft. In 1947 a plane piloted by Chuck Yeager burst the "sound barrier" and created the first sonic boom. In the decades afterward sonic booms became a familiar sound to Americans. （Because of steps that were eventually taken, sonic booms are rarely heard anymore.） Today sonic is often used by ambitious rock musicians to describe their experimental sounds. dissonant 1、 Clashing or discordant, especially in music.
2、 Incompatible or disagreeing.
🌱Critics of the health-care plan pointed to its two seemingly dissonant goals: cost containment, which would try to control spending, and universal coverage, which could increase spending. 🌳Since dissonant includes the negative prefix dis-, what is dissonant sounds or feels unresolved, unharmonic, and clashing. Early in the 20th century, composers such as Arnold Schoenberg and his students developed the use of dissonance in music as a style in itself. But to many listeners, the sounds in such music are still unbearable, and most continue to prefer music based on traditional tonality. Dissonant is now often used without referring to sound at all. Cognitive dissonance, for example, is what happens when you believe two different things that can't actually both be true. resonance 1、 A continuing or echoing of sound.
2、 A richness and variety in the depth and quality of sound.
🌱The resonance of James Earl Jones's vocal tones in such roles as Darth Vader made his voice one of the most recognizable of its time. 🌳Many of the finest musical instruments possess a high degree of resonance which, by producing additional vibrations and echoes of the original sound, enriches and amplifies it. Violins made by the Italian masters Stradivari and Guarneri possess a quality of resonance that later violinmakers have never precisely duplicated. And you may have noticed how a particular note will start something in a room buzzing, as one of the touching surfaces begins to resonate with the note. Because of that, resonance and resonate—along with the adjective resonant—aren't always used to describe sound. For example, you may say that a novel resonates strongly with you because the author seems to be describing your own experiences and feelings. ultrasonic Having a frequency higher than what can be heard by the human ear.
🌱My grandfather's dog is always pricking up its ears at some ultrasonic signal, while he himself is so deaf he can't even hear a bird singing. 🌳Ultrasound, or ultrasonography, works on the principle that sound is reflected at different speeds by tissues or substances of different densities. Ultrasound technology has been used medically since the 1940s. Sonograms, the pictures produced by ultrasound, can reveal heart defects, tumors, and gallstones; since low-power ultrasonic waves don't present any risks to a body, they're most often used to display fetuses during pregnancy in order to make sure they're healthy. Ultrasonics has many other uses, including underwater sonar sensing. High-power ultrasonics are so intense that they're actually used for drilling and welding.