How much is the difference between the sound of speech at 40 decibels, 1 meter away, and 2 meters aw

The attenuation of sound intensity is proportional to the square of the distance, so we can calculate the difference in the intensity of the sound heard at 1 meter away and 2 meters away based on the ratio of the distance.

First of all, the original sound intensity was 40 decibels. According to the definition of sound intensity, 40 decibels is equivalent to the power of sound is 1 microwatt.

Assuming that the distance of sound propagation is 1 meter and 2 meters, the attenuation of sound intensity is x and y, respectively.

Based on the relationship that the attenuation of sound intensity is proportional to the square of the distance, we can list the following two equations:

1.x = 40 - 20*log10(1) (sound intensity at 1 meter).

2.y = 40 - 20 * log10(2) (sound intensity at 2 meters).

Solving this system of equations, we can get the values of x and y.

x = 40 - 20 * log10(1) = dB.

y = 40 - 20 * log10(2) = dB.

So, the intensity of sound heard at 1 meter away is decibels, and the intensity of sound heard at 2 meters away is decibels. The difference between them is decibels.

If you speak 40 decibels, the sound heard from one meter away should be 35 decibels, and the sound heard from two meters away should be 25 decibels.

The difference between a typical 40 decibel and a distance of one or two meters is particularly large, because the propagation distance of this sound is attenuating.

If it is 40 decibels, the difference between the outer hall of one meter and two meters is very large, because the sound is transmitted through sound waves, and after the sound waves are transmitted for a certain distance, it will continue to attenuate, right?

Summary. OK.

The frequency that humans can generally hear is between 1 Hz and 20 kilohertz, and the hearing range is limited Ultrasound refers to the sound above 20000Hz, and the human ear cannot hear ultrasound Infrasound refers to the sound below 20Hz, and the human ear cannot hear infrasound, in addition to the sound below 20 decibels, in general, we think it is quiet, of course, generally speaking, below 15 decibels, we can consider it to belong"Dead silence"of. 20-40 decibels is about the whisper in a couple's ear. 40-60 decibels is our normal conversational sound.

More than 60 decibels belong to the noisy range, 70 decibels we can think that it is very noisy, and begin to damage the hearing nerve, more than 90 decibels will make hearing impaired, and stay in a space of 100-120 decibels, if there is no accident, a minute human beings will be temporarily deaf (deaf). As for how far the human ear can hear the sound, it depends on the size of the sound source, whether it is an acoustic sound or an echo, whether there are obstacles in the environment, temperature, humidity, etc. So the question of how far you can hear is difficult to answer.

Your question is not quantitative, or you should ask in what environment, how loud the decibel sound, and at what distance the average person can hear it.

In a normal environment, we can't hear if we speak more than 15 meters normally, and as for long distances, thunder is thousands of meters away from us. It can also be heard.

Can you hear clearly in a 40 decibel environment and 10 meters away?

Hello, I am glad to serve you, I have received your question, and I am sorting out the answer for you, it takes time to guess the word on the bridge, and please be patient and wait for a while, and answer it for you immediately! Potato eyes.

Can humans generally hear the frequency between 1 Hz and 20 kHz, the hearing range is limited Ultrasound refers to the sound of premature beats higher than 20000Hz, the human ear can not hear ultrasound Infrasound refers to the sound below 20Hz, the human ear can not hear infrasound, in addition to the sound below 20 decibels, generally speaking, we think it is quiet, of course, generally speaking, below 15 decibels, we can consider it to belong"Dead silence"of. 20-40 decibels is about the whisper in a couple's ear. 40-60 decibels is our normal conversational sound.

More than 60 decibels belong to the noisy range, 70 decibels we can think that it is very noisy, and begin to damage the hearing nerve, more than 90 decibels will make hearing impaired, and stay in a space of 100-120 decibels, if there is no accident, a minute human beings will be temporarily deaf (deaf). As for how far the human ear can hear the sound, it depends on the size of the sound source, whether it is an acoustic sound or an echo, whether there are obstacles in the environment, temperature, humidity, etc. So the question of how far you can hear is difficult to answer.

Your question is not quantitative, or you should ask in what environment, how loud the decibel sound, and at what distance the average person can hear it. In a normal environment, we will not be able to hear if we speak normally for more than 15 meters, and as for the long slow distance, the thunder is several kilometers away from us. Lu Naxiang can also be heard.

Hello Soling Gaoqin, it is absolutely inaudible, and it is very close to hear clearly. The frequency that humans can generally hear is between 1 Hz and 20 kilohertz, and the hearing range is limited Ultrasound refers to the sound above 20,000 Hz, and the human ear cannot hear ultrasound Infrasound refers to the sound below 20 Hz, and the human ear cannot hear the infrasound, in addition to the sound below 20 decibels, generally speaking, we think it is quiet, of course, generally speaking, below 15 decibels, we can consider it to belong"Dead silence"of. 20-40 decibels is about the whisper of a couple's ear.