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because it's too high pitched. humans can't hear sounds past a certain pitch.
Bats. They are blind and use echolocation to navigate when they are flying. They emit high pitched sounds humans ears are unable to hear. The sound frequency in a human voice is too low pitched for them to hear.
Most animals can, but dogs can definitely hear them.
Human hearing is most effective in the range of about 20 Hz to 20,000 Hz. Slightly lower frequency sounds may be heard or "felt." Some sounds outside this range can be heard by some individuals. Some animals have a wider range of hearing, such as dogs who can hear higher pitched (higher frequency) sounds.
I would call it an unaudible.
For humans it is, because most of the sound is at frequencies too low for us to hear.
Different animals can perceive sounds at different wavelengths. For example a dog whistle has a frequency which dogs can hear but is too high for humans. Furthermore, people's sensitivity to sound frequency changes with age. In general, ordinary range for humans is 20 to 20,000 Hz.
Different animals can perceive sounds at different wavelengths. For example a dog whistle has a frequency which dogs can hear but is too high for humans. Furthermore, people's sensitivity to sound frequency changes with age. In general, ordinary range for humans is 20 to 20,000 Hz.
The human ear cannot detect all possible frequencies. It has evolved to detect frequencies of sounds that are the most useful to humans, and has a maximum frequency range of about 20Hz to 20kHz, which decreases as you get older, particularly at the higher end. Infrasonic describes sounds that are too low in frequency to be heard by the human ear, and ultrasonic describes sounds that are too high in frequency to be heard by the human ear. These sounds cannot be heard by the human ear because they are outside of its range of capability.
you make sounds with your voice. You blow air, and add some of your voice too. This is called 'speaking'.You also hear sounds with your ears.
Elephants make a number of sounds. They make specific sounds related to sex and danger which we can hear and understand. However, they have a much larger number of sounds which are too low in frequency (infra sound) for our ears to hear which is propagated via the elephant's legs and feet through the ground over great distances. The most common sound (that we can hear) that elephants make is called trumpeting. We can also hear them make a low rumbling noise. Examples of this can be heard by clicking on the related link.
Human hearing range is around 20 Hz to 20,000Hz. So most things under 20Hz