Environmental Protection Daily Question (12.24)
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Definition: What is a “decibel”? A decibel is a unit used to measure the ratio of quantities of two identical units, primarily employed to quantify sound intensity, and is commonly denoted as dB. 1 decibel: A sound just barely audible. Below 15 decibels, it’s considered quiet; 30 decibels is the volume of a whisper. 40 decibels corresponds to the humming sound of a refrigerator. 60 decibels is the volume of normal conversation. 70 decibels is similar to the noise level in a busy urban area. 85 decibels is the noise level on a road with traffic. 95 decibels is the sound of a motorcycle starting up. 100 decibels is the volume of a power drill used during construction work. 110 decibels is the noise level from karaoke or loud MP3 playback. 120 decibels is the sound of an airplane taking off. 15 decibels is the noise level produced by fireworks. The American Speech-Hearing Association warns that exposure to noise levels of 50 decibels at night over a long period of time can lead to cardiovascular diseases ； 55 decibels can have a negative impact on children’s learning ； 60 decibels – enough to wake a person from sleep ； 70 decibels increases the incidence of myocardial infarction by about 30% ； Above 110 decibels can cause permanent hearing damage.
A decibel is a unit used to measure the ratio of quantities of two identical units, primarily employed to quantify sound intensity, and is commonly denoted as dB. “\"Deci-\" refers to one-tenth, and the unit for the individual value is \"bel\"; generally, decibels are used. The decibel is named after the American inventor Alexander Graham Bell.
Decibels are a unit of sound pressure level, denoted as dB. It is a unit used to measure the relative intensity of sound; the decibel value represents a unit of measurement for sound.
A decibel is a unit used to measure the ratio of quantities of two identical units, primarily employed to quantify sound intensity, and is commonly denoted as dB.
Decibels are the unit used to measure the volume of sound, and this unit is commonly employed to determine whether something constitutes noise
A decibel is a unit used to measure the ratio of quantities of two identical units, primarily employed to quantify sound intensity, and is commonly denoted as dB.
Decibels represent a unit, which is the ratio of two electrical or acoustic powers, or the ratio of two voltage or current values, or similar measures of sound intensity； Decibels are also a unit used to measure the relative loudness of sound.
A decibel is a unit used to measure the ratio of quantities of two identical units, primarily employed to quantify sound intensity, and is commonly denoted as dB.
The decibel is a unit in electrical and acoustic measurement. It is the ratio of two electrical or acoustic powers, or the ratio of two voltage or current values, or similar measures of sound intensity; decibels are also a unit used to measure the relative loudness of sound. Decibels are denoted by dB