Ultrasonic.
Or do you mean what causes them :
all types of electrical machinery including TV sets,
humming birds,
mice (singing)
insects.
Sound is created by the vibration of air. The faster the vibration, the higher the sound. Smaller objects can vibrate faster than larger objects (of the same kind) and therefore have a higher pitched sound.
A sound with a low pitch typically has a lower frequency, meaning the sound wave oscillates at a slower rate. This results in a slower perception of the sound compared to higher-pitched sounds.
Short-wavelength sound waves, such as those with high frequencies, produce a high pitch. When an object vibrates quickly, it generates fast compressions and rarefactions in the air, resulting in a high-frequency sound wave that our ears perceive as a high pitch.
Low amplitude sound waves produce quieter sounds that are less intense and have lower volume. They are typically perceived as softer and less powerful compared to high amplitude sounds.
Monochromatic, coherent, electromagnetic energy tuned over a wide range of frequencies/wavelengths.
Shorter wavelengths give rise to higher pitches. However, pitch isn't so black and white. It includes many other variables such as the individual, overtones, volume and the audible perceptions they give rise to. To get a fuller understanding of pitch, it would be best to ask a serious musician.
As for any kind of equalizer, the ranges of the differing frequencies are as to your preference. If you like something that sounds like a "blue room" jazz guitar, a little higher on the lower frequencies, lower near the middle and a little higher on the high (the classic EQ smiley face). Fiddle with the settings and find a sound you like, there is no right and wrong.
No, light is not part of the radio spectrum. But, both the radio spectrum and light are part of the electromagnetic spectrum. The electromagnetic spectrum is a range of frequencies from very low to very high. Light frequencies are higher than radio frequencies but both are the same kind of thing.
Several animal species are able to hear frequencies well beyond the human hearing range. Some dolphins and bats, for example, can hear frequencies up to 100 kHz. This called ultrasound.Elephants can hear sounds at 14–16 Hz, while some whales can hear subsonic sounds as low as 7 Hz (in water).
Their respective wavelengths (frequencies).
Sound is created by the vibration of air. The faster the vibration, the higher the sound. Smaller objects can vibrate faster than larger objects (of the same kind) and therefore have a higher pitched sound.
Well it depends. There is actually no way to answer this question EXACTLY correct but i can answer it a bit right. Usually yes. Smaller dogs tend to have smaller higher squeakier yapping sounds for there bark. However my dauchshund has a low bark that is kind of sounds like a big dog.
A mixture of all the visible frequencies.
There are lots of sounds infact there are plenty for anyone to like.
Sounds
Bar Graph
Dissonance and Consonance