The musical interval between two tones of frequencies $320 \ Hz$ and $240 \ Hz$ is

The power of a sound from the speaker of a radio is $20 \text{ mW}$. By turning the knob of the volume control,the power of the sound is increased to $400 \text{ mW}$. The power increase in decibels as compared to the original power is .... $\text{dB}$

If the threshold of hearing is assumed to be the reference $(0 \ dB)$,then the threshold of pain is taken to be $120 \ dB$. Let the corresponding sound intensities be $I_0$ and $I$ respectively. Then $\frac{I_0}{I}$ is:

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

$A$ 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 $dB$)?

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).