What is the max Decibel(unit of sound) for the person ?and what is relation between Decibel and watt?

Answer 1

On the decibel scale, the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB. Here are some common sounds and their decibel ratings:

Near total silence - 0 dB
A whisper - 15 dB
Normal conversation - 60 dB
A lawnmower - 90 dB
A car horn - 110 dB
A rock concert or a jet engine - 120 dB
A gunshot or firecracker - 140 dB
You know from your own experience that distance affects the intensity of sound -- if you are far away, the power is greatly diminished. All of the ratings above are taken while standing near the sound.
Any sound above 85 dB can cause hearing loss, and the loss is related both to the power of the sound as well as the length of exposure. You know that you are listening to an 85-dB sound if you have to raise your voice to be heard by somebody else. Eight hours of 90-dB sound can cause damage to your ears; any exposure to 140-dB sound causes immediate damage (and causes actual pain).
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Have you ever wondered why a 100 Watt amp doesn't sound twice as load as a 50 Watt amp? It's because double the power is equivalent to only a 3dB increase in volume!

This is the same for any power comparison: provided you use the same speakers, and the same amp design (more on that later), 60 watts is 3dB louder than 30 watts, 400 watts is 3dB louder than 200 watts, etc.

Likewise, double the volume requires roughly a 6dB increase, which is equivalent to 4 times the power!

Answer 2

there are 2 different deciBels, both originate from audio strength measurement.

one is used to measure absolute sound pressure (hearing). the other is used by telephone engineers.

the telephone decibel defines zero dB as 1 milliwatt into 600 ohms. This produces a good sound level when listening on a phone and is the design standard for telephone circuits. The idea of dB as a measure of power (specifically a milliwatt) is widely used by communication engineers. 30 dBm is a power level of 1 watt. A microphone generates about minus 60 dBm of audio output.

The suffix after the dB is used to designate various adaptations of the dB method. dBu means power referenced to 1 microvolt for RF field measurements. dBK means reference to 1 Kilowatt for FCC effective radiated broadcast power calculations.

Answer 3

Decibels are not units of sound. Decibels are a log scale that can be applied to any ratio. For sound, the decibel level refers to the ratio of the measured sound to a base unit of sound which would be measured in power.

Answer 4

0 db = threshold of hearing
10 db = virtual silence
20 db = quiet room
110 db = pneumatic drill
120 db = airplane engine roar
130 = threshold of pain
above is based on sinusoidal wave of 1000 hz
db = 10*Log(input watt/output watt)

Answer 5

I think they covered it pretty good except the safe sound level established by OSHA sound is 85 dB of music or noise anything above that u should ware hearing protection.