0
[with the usual proviso that they were not a boilermaker, had congenital deafness ... ... .]
Thus one half of the population will have hearing more sensitive than this, and one half less sensitive. Ordinary speech is around the 55dB to 70dB.
Sounds greater than 85dB are considered to be damaging, if over an 8 hour period.
That is the sounds against which you'd have to raise your voice significantly to be heard at 600mm distance. At this level and above, you should be wearing hearing protection.
At levels above120dB you will start to feel pain. At levels above 130dB there will be instant damage.
[A fighter pilot's helmet is designed to shield as much of the hard tissue of the head from sound as possible, in order to prevent hearing loss. ]
Still curious? Ask our experts.
Chat with our AI personalities
Ezra
Rene
JordanAdd your answer:
Earn +20 pts
How much points are acceptable per 100 Square yards?
Infinitely many.
How much is a decibel?
A decibel (dB) has meaning only when compared a quantity (P1, V1, or I1) with a reference (P0, V0, or I0). Since it is a ratio of two like quantities, it is dimensionless. For a power ratio, power gain = 10 * log10(P1/Po) in [dB]. For a voltage ratio, voltage gain = 20 * log10(V1/Vo) in [dB]. For example, when P1 = 100 * P0, the power gain = 10 * log10(100) [dB] = 20 dB.
How much is 3 percent of human race?
About 200,000,000.
If a 99.79 kg man jumps from the top of a 176.8 meter tall building how long does it take for his body to decelerate to 0 ms once first contact with the ground is made?
It depends upon how much the ground deforms once the first bit of his body hits the ground, and how much his body deforms once the first bit of his body has hit the ground. The former is likely to be much less than the second (unless it is a specially designed landing area, say, for a stunt man jumping of a tall building where it will be designed to deform much more than the body of the stunt man so as to ensure there is near enough no traumatic stress on his body). It will be any time greater than 0 seconds, the the amount of time depends as above.
How much one decibel?
1 decibel of increase of sound level is the smallest increase (or decrease) in level that may be discerned by the average person. It corresponds to an increase in level of about 25%. [The 10th root of 10 is another similar expression.] The decibel was initially used to measure changes in signal level in a line. Named after Alexander Graham Bell. One Bell - 10dB - sounds twice as loud to those same average individuals.
