Question

Check all correct statements about sound characterization

Question 8 options:

	Sound pressures can be added and subtracted
	The dB scale is a logarithmic scale.
	Sound pressures take into account the frequency of the sound
	Average sound pressure is measured in dB

Answer 1

The first statement is correct .We can add and subtract sound pressures.Sound pressures are expressed in dB which is a logarithemic scale.Hence are not adding dB plus dB like in normal arithemetic calculations.For example if we want to add 80dB +80dB,

Total=10log(10^80/10+10^80/10)=10log(2×10^8)=83dB.

Similarly you can subtract the two dB values also.

The 2nd statement is also correct.dB scale is a logarithimic scale .we can understand it from above example.

The third statement is also correct.for measuring sound the frequency of the sound is taken in to account by sound level meters.

The fourth statement is also correct.Average sound pressures are measured in decibels.(dB).