The intensity level of a sound of intensity $I$ is $30 \, dB$. The ratio $\frac{I}{I_0}$ is (where $I_0$ is the threshold of hearing).

The note "Saa" on the Sarod and the Sitar have the same pitch. The property of sound that is most important in distinguishing between the two instruments is

$A$ group of people watch an ice show held in a closed area. Skaters perform a music show whose sound level is $60 \ dB$. $A$ spectator can yell at $40.0 \ dB$. Which one of them represents the approximate combined sound level (in $dB$)?

In an orchestra,the musical sounds of different instruments are distinguished from one another by which of the following characteristics?

The tones that are separated by three octaves have a frequency ratio of

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?