Decibel Scale and Reference Value

Question 1

Power level

Answer 1

Level means it is in dB not watts, note that power level is the same as intensity level

Question 2

When sound pressure doubles, pressure levels increase by

Answer 2

6 dB SPL

Question 3

When sound intensity doubles, the intensity levels increase by

Answer 3

3 dB IL

Question 4

Two or more sound sources of equal intensity

Answer 4

The intensity level increases by 3db for a doubling intensity, the intensity level increases by factor of 10dB for a 10x increase in intensity.

Sound pressure level increases by 6db for a doubling in sand pressure. The sand pressure level increases by a factor of 20dB for a 10x increase in sound pressure.

Question 5

Total sound intensity level cheat way

Answer 5

Total level = level for 1 + 10 x log #

Note they all have to be the same intensity to do it this way.