# How do you calculate dB in physics?

## How do you calculate dB in physics?

Three steps are needed to calculate the decibel level of the sound given above:

1. Find the ratio of the sound intensity to the threshold intensity.
2. Take the logarithm of the ratio.
3. Multiply the ratio by 10.
4. Divide the decibel level by 10.
5. Use that value as the exponent of the ratio.

### How do you calculate decibel distances?

In a free field – a doubling of the distance from a noise source reduces the sound pressure level with 6 decibel. A “free field” is defined as a flat surface without obstructions….Example – Rifle Shot and Sound Pressure at Distance.

Distance (feet) Sound Pressure Lp (decibel)
1.25 134
2.5 128
5 122
10 116

#### What is the intensity of a 20 dB sound?

The Threshold of Hearing and the Decibel Scale

Source Intensity Intensity Level
Threshold of Hearing (TOH) 1*10-12 W/m2 0 dB
Rustling Leaves 1*10-11 W/m2 10 dB
Whisper 1*10-10 W/m2 20 dB
Normal Conversation 1*10-6 W/m2 60 dB

How to calculate the trajectory of a projectile?

Equations associated to the trajectory motion (projectile motion) are articulated as, Where, the initial Velocity is V o , the component along the y-axis is sin θ, the component along the x-axis is cos θ. Projectile Motion formula is made use of to calculate the distance, velocity and time engaged in the projectile motion.

Which is the correct formula for projectile motion?

Projectile motion is one among them. A projectile is some body thrown in space or air. The Curved path with which the projectile travels is what is termed as trajectory. The free fall motion of any object in a horizontal path with constant velocity is Projectile Motion. the initial velocity along the y-axis is V yo .

## Which is the correct formula for Decibel of power?

The deciBel formula or equation for power is given below: N dB = 10 log 10 (P 2 P 1)

### How is the decibel scale used in electronics?

The deciBel, dB is a logarithmic scale used for comparing two physical quantities especially in electronics. There are several easy to remember formulas that enable the values to be calculated