Table of Contents
What is the intensity of a 120 dB sound?
1
The decibel scale
| decibels | intensity* | type of sound |
|---|---|---|
| 120 | 1 | amplified rock music; near jet engine |
| 110 | 10−1 | loud orchestral music, in audience |
| 100 | 10−2 | electric saw |
| 90 | 10−3 | bus or truck interior |
How do you find the intensity of a decibel and distance?
Starts here12:13Sound Intensity Level in Decibels & Distance – Physics ProblemsYouTubeStart of suggested clipEnd of suggested clip53 second suggested clipHow can we find the intensity. Level. So here’s the formula that you need the decibels is equal toMoreHow can we find the intensity. Level. So here’s the formula that you need the decibels is equal to ten times log of the intensity divided by the threshold of intensity or the threshold of hearing.
How does sound level change with distance?
The area of a surface around a point sound source increases with the square of the distance from the source. For every doubling of distance, the sound level reduces by 6 decibels (dB), (e.g. moving from 10 to 20 metres away from a sound source).
What is the intensity level at a distance 5.00 m from the source?
At a distance of 5.0 m from a point sound source, the sound intensity level is 110 dB.
How do you find the intensity level 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.
How do you find sound intensity?
What determines the intensity of sound?
Intensity results from two factors: the amplitude of the sound waves and how far they have traveled from the source of the sound. It depends on the amount of energy that started the waves. Greater amplitude waves have more energy and greater intensity, so they sound louder.
Does sound intensity depend on distance?
The intensity varies inversely with the square of the distance from the source. So if the distance from the source is doubled (increased by a factor of 2), then the intensity is quartered (decreased by a factor of 4).
Why does the intensity of sound decrease with distance?
As distance from the sound source increases, the area covered by the sound waves increases. The same amount of energy is spread over a greater area, so the intensity and loudness of the sound is less. This explains why even loud sounds fade away as you move farther from the source.
What is the intensity of 100 dB sound?
The Threshold of Hearing and the Decibel Scale
| Source | Intensity | Intensity Level |
|---|---|---|
| Busy Street Traffic | 1*10-5 W/m2 | 70 dB |
| Vacuum Cleaner | 1*10-4 W/m2 | 80 dB |
| Large Orchestra | 6.3*10-3 W/m2 | 98 dB |
| Walkman at Maximum Level | 1*10-2 W/m2 | 100 dB |
How is the intensity of sound measured?
The intensity of a sound is the power of the sound in Watts divided by the area the sound covers in square meters. The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing. It is measured in decibels (dB). The threshold of human hearing has an intensity of about .