Table of Contents
What is the intensity of a 90 dB sound?
Learning Objectives
| Table 1. Sound Intensity Levels and Intensities | ||
|---|---|---|
| Sound intensity level β (dB) | Intensity I(W/m2) | Example/effect |
| 80 | 1 × 10–4 | Loud radio, classroom lecture |
| 90 | 1 × 10–3 | Inside a heavy truck; damage from prolonged exposure |
| 100 | 1 × 10–2 | Noisy factory, siren at 30 m; damage from 8 h per day exposure |
How do you calculate intensity of sound?
Sound intensity can be found from the following equation: I=Δp22ρvw I = Δ p 2 2 ρ v w Δ p – change in pressure, or amplitude ρ – density of the material the sound is traveling through vw – speed of observed sound. The larger your sound wave oscillation, the more intense your sound will be.
What is the intensity of 100 dB?
The sound intensity level
| Sound intensity level (dB) | Example/effect |
|---|---|
| 90 | Inside a heavy truck; damage from prolonged exposure 1 |
| 100 | Noisy factory, siren at 30 m; damage from 8 h per day exposure |
| 110 | Damage from 30 min per day exposure |
| 120 | Loud rock concert; pneumatic chipper at 2 m; threshold of pain |
What sound intensity level in dB is produced by earphones that create an intensity of 4.00 10 − 2w m2?
106 decibels
And it is 10 times logarithm of the intensity divided by some reference intensity which is the threshold of hearing. So 10 times the logarithm of 4.00 times 10 to the minus 2 watts per square meter divided by 10 to the minus 12 watts per square meter is 106 decibels.
How many decibels (dB) is the difference between two sound intensity levels?
This means that the two sound intensity levels differ by 3.01 dB, or about 3 dB, as advertised. Note that because only the ratio is given (and not the actual intensities), this result is true for any intensities that differ by a factor of two.
How many decibels (dB) is too high?
Sound Intensity Levels and Intensities [1] Several government agencies and health-related professional associations recommend that 85 dB not be exceeded for 8-hour daily exposures in the absence of hearing protection.
Why is the decibel level of a sound zero?
The bel, upon which the decibel is based, is named for Alexander Graham Bell, the inventor of the telephone. The decibel level of a sound having the threshold intensity of is , because . That is, the threshold of hearing is 0 decibels. (Figure) gives levels in decibels and intensities in watts per meter squared for some familiar sounds.
What is the difference between 80 dB and 87 dB?
This 87 dB sound has an intensity five times as great as an 80 dB sound. So a factor of five in intensity corresponds to a difference of 7 dB in sound intensity level. This value is true for any intensities differing by a factor of five.