The intensity level of a sound whose intensity is $10^{-8} \ W/m^2$ is: (in $dB$)

In a city,the sound intensity level increases uniformly by about $1 \ dB$ annually. How many years will it take for the intensity of sound to become double?

In the musical octave 'Sa','Re','Ga',which of the following statements is correct regarding their frequencies?

$A$ sound absorber attenuates the sound level by $20 \ dB$. The intensity decreases by a factor of

Each of the properties of sound listed in column $A$ primarily depends on one of the quantities in column $B$. Choose the matching pairs from the two columns.
Column $A$ | Column $B$
Pitch | Waveform
Quality | Frequency
Loudness | Intensity

To raise the pitch of a stringed musical instrument,the player can: