Vroom

A cacophony is a mishmash of unpleasant sounds, often at loud volume. A cacophony is a jarring, discordant mix of sounds that have no business being played together.

Sample answer: The different types of noise include physical, semantic, psychological, and physiological. Each interferes with the process of communication in different ways. Physical noise is any sort of outside communication effort by someone or something, for example a loud noise that interrupts or distracts you.

Brain imaging has shown that when we hear an unpleasant noise the amygdala modulates the response of the auditory cortex heightening activity and provoking our negative reaction. …

Humans with normal hearing can hear sounds between 20 Hz and 20,000 Hz. Frequencies above 20,000 Hz are known as ultrasound.

This measurement of cycles per second is expressed in Hertz (Hz), with a higher Hz representing higher frequency sound. Low-frequency sounds are 500 Hz or lower while high-frequency waves are above 2000 Hz. People with hearing loss usually have trouble hearing sounds in the higher frequency range.

The most dangerous frequency is at the median alpha-rhythm frequencies of the brain: 7 hz. This is also the resonant frequency of the body’s organs.

Humans generally have a hearing range of between 20 and 20,000 hz, which is actually very impressive. However, elephants can hear waves as low as 14 hz, while cats can hear up to 64,000 hz frequencies, and bats can sometimes pick up noises as high as 200,000 hz.

7 hz

75M Hz

We can’t hear frequencies above 15 to 20 kHz (varies by person) due to the shape of our outer ears, the transmission characteristics of our middle ears, and the nature of the cochlea to not be responsive to frequencies above 15 to 20 kHz.

The commonly stated range of human hearing is 20 to 20,000 Hz. Under ideal laboratory conditions, humans can hear sound as low as 12 Hz and as high as 28 kHz, though the threshold increases sharply at 15 kHz in adults, corresponding to the last auditory channel of the cochlea.

Humans can generally sense sounds at frequencies between 20 and 20,000 cycles per second, or hertz (Hz)—although this range shrinks as a person ages. Prolonged exposure to loud noises within the audible range have long been known to cause hearing loss over time.

The hearing range of nearly all mammals is wider than the frequency range they can produce with their voices. This is because the top end of our hearing range has evolved to help us accurately detect the direction of a sound. The human ear can hear frequencies up to 20kHz but we can’t scream higher than 3kHz or so.

Especially dangerous is infrasound at the frequency of 7 Hz, since this sound, generating frequencies, close to characteristic frequencies of the organs of our body, may disturb the heart or brain activity. Machines, natural sources storms, earthquakes, hurricanes, etc. generate infrasound.