Question

all the following are linear values. look at the units and write down whether they represent power, intensity or pressure. then, using the appropriate reference values, convert them to decibels levels.

a) 1W

b) 0.3 Pa

c) 4W/m^2

d)10 Pa

e) 0.5 W

f) 0.006 W/m^2

Answer 1

a) 1W is the unit of power.

conversion-->>    1W = 30 dBm

b) 0.3pa is the unit of pressure.

conversion-->>    0.3pa = 83.521 dB

c) 4W/m^2 is the unit of sound intensity.

conversion-->>    4 W/m^2 = 126.02 dB

d) 10pa is the unit of pressure.

conversion-->> 10 pa = 113.97 dB

e) 0.5W is the unit of power.

conversion-->> 0.5 W = 26.98 dBm

f) 0.0006W/m^2 is the unit of sound intensity.

conversion-->>    0.006 W/m^2 = 97.78 dB.

"dB is relative unit that represent a ratio, dBm is absoulte unit that is referenced to 1mW.

you can't convert dB to dBm"

eg. 1W= 1000mW = 10 log 10 (1000) = 30 dBm