The built environment and sound - Different types of sound sources

5 important questions on The built environment and sound - Different types of sound sources

What is a spherical source?

This source radiates the same amount of energy in all directions

What is a line source?

An, in one dimension, infinitely long source emitting as much energy in all direction perpendicular to the line. This results in cylindrical sound waves

What is a place source?

A 2-dimensional infinite source emits as much energy in all directions perpendicular to the plane, resulting in planar sound waves.
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What is the Q in the formula for the sound pressure level in this case?

Q stands for direction factor of a spherical source. 1,2,4 and respectively 8

With how much does the sound pressure level increase, relative to the free field?

9 dB

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