What is the relationship between decibels and intensity of sound?
The scale for measuring intensity is the decibel scale. The threshold of hearing is assigned a sound level of 0 decibels (abbreviated 0 dB); this sound corresponds to an intensity of 1*10-12 W/m2. A sound that is 10 times more intense ( 1*10-11 W/m2) is assigned a sound level of 10 dB.
What is the intensity of a 70 dB sound?
Learning Objectives
| Table 1. Sound Intensity Levels and Intensities | ||
|---|---|---|
| Sound intensity level β (dB) | Intensity I(W/m2) | Example/effect |
| 70 | 1 × 10–5 | Noisy office, busy traffic |
| 80 | 1 × 10–4 | Loud radio, classroom lecture |
| 90 | 1 × 10–3 | Inside a heavy truck; damage from prolonged exposure |
What is the intensity of 60 dB sound?
What is the intensity of a 60 dB sound? Answer in terms of 10^-6 W/m^2 .
What is the intensity of a 45 decibel sound?
45 to 60 dB – Moderate.
What is sound intensity proportional to?
pressure squared
The intensity of a sound wave is proportional to the change in the pressure squared and inversely proportional to the density and the speed.
Why is sound intensity measured in decibels?
Decibels measure sound intensity (amplitude) In daily life, this corresponds to how low- or high-pitched something is. A child’s voice is high frequency, for example. Health-wise, many older adults develop what’s known as high-frequency hearing loss, making it harder to hear sounds that are higher pitched.
What is the intensity of 80 dB sound?
The sound intensity level
| Sound intensity level (dB) | Example/effect |
|---|---|
| 60 | Normal conversation |
| 70 | Noisy office, busy traffic |
| 80 | Loud radio, classroom lecture |
| 90 | Inside a heavy truck; damage from prolonged exposure 1 |
How much more intense is a sound of 50 dB than a sound of 40 dB?
1 Expert Answer The ratio is 10, so the correct answer is that 50 db sound is 10 times as loud as the 40 db sound.
How much louder is 70 dB to 50 dB?
4 times
Following the same logic, you may perceive a 70 dB sound as being 4 times as loud as a 50 dB sound. In fact, a 70 dB sound is 100 times more intense than a 50 dB sound.
How do you find the intensity of a decibel?
Three steps are needed to calculate the decibel level of the sound given above:
- Find the ratio of the sound intensity to the threshold intensity.
- Take the logarithm of the ratio.
- Multiply the ratio by 10.
- Divide the decibel level by 10.
- Use that value as the exponent of the ratio.