How many decibels can a normal person hear? What scientific knowledge is shared?

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The size of the sound we hear is actually the frequency of the sound, expressed in Hertz. Generally, the sound frequency that normal people hear has a certain range. If it is too low, it will be inaudible, and if it is too high, it will damage the ears. So, what is the specific frequency range of sounds that the human ear can hear? How many Hertz can a normal person hear?


How many decibels of sound can a normal person hear? What scientific knowledge is shared?

Normal decibels should be 40 to 60 decibels.

Sound below 40 decibels has no effect on the human body; when the sound is between 40 and 60 decibels, the nervous system of the human body will be affected if it is in this environment for a long time. At this time, every time the noise increases by 3 decibels on average, the noise energy will double; when the sound reaches 65 decibels to 80 decibels, the degree of cardiovascular damage of a person is 20 times higher than that of people living in an environment with a noise of 50 decibels. %above. When the noise exceeds 80 decibels, it will cause great damage to human hearing. When the noise exceeds 100 decibels, it is considered unbearable noise. The sound reaches more than 120 decibels, which is equivalent to a Boeing 747 flying by. Human health will be greatly harmed in a short period of time. At 180 decibels, people's ears will immediately become deaf.


According to the hearing of ordinary people:
0-20 decibels: very quiet, almost imperceptible;
20-40 decibels: quiet, like a whisper;
40-60 decibels: general, ordinary indoor conversation;
60-70 decibels: noisy, damaging to nerves;
70-90 decibels: very noisy, nerve cells are damaged;
> 90-100 decibels: Intensified noise, hearing loss;
100-120 decibels: Unbearable, temporary deafness will occur if left for one minute;

Above 120 decibels: Extreme deafness or total deafness;

According to the World Health Organization deafness classification standards:
26 to 40 decibels: mild deafness;
41 to 55 decibels: moderate deafness;
56 to 70 decibels: moderate to severe deafness ;
71~90 decibels: severe;

Volume analogy:
190 decibels: causing death;
140 decibels: the highest threshold that causes complete hearing loss defined by the European Union point;
139 decibels: the shouts of Schalke fans;
130 decibels: the sound of rocket launches;
125 decibels: the sound of jets taking off;
120 decibels: Staying in this environment for more than one minute will cause temporary hearing loss;
110 decibels: the sound of a propeller plane taking off, the sound of a rock concert;
105 decibels: permanentLong-term hearing loss;
100 decibels: the sound of a pneumatic drill, the sound of a compression hammer hitting heavy objects;

90 decibels: the sound of a noisy bar environment, the sound of an electric saw cutting wood;

85 decibels and below: Will not damage the hair cells in the cochlea;
80 decibels: Noisy offices, sounds on the highway;
75 decibels: The upper limit of human ear comfort ;

70 dB: Street environment sound;

50 dB: Normal conversation sound;

20 dB: Whispering.


According to relevant reports, the hearing range of mice is biased towards high pitches, between 2300 and 85500 Hz. Because the hearing organs of animals with smaller ears resonate at higher frequencies, the hearing range is wider. In a choir, the soprano who plays the treble part can produce sounds ranging from 300 to 1000 Hz. The sound produced by the bass, which plays the bass part, is between 90 and 300 Hz.

However, the vocal ranges of both sopranos and basses are lower than the hearing range of mice, so mice cannot hear when humans speak in low voices. So in theory, when we whisper softly, we don’t have to worry about being overheard by mice.

However, because human voices are often mixed with sounds of various frequencies, mice can still hear human voices in daily life.