In a harmonium,the intermediate notes between a note and its octave form:

The intensity level due to two waves of the same frequency in a given medium are $1 \, bel$ and $5 \, bel$. Then the ratio of amplitudes 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 $dB$)?

The intensity of sound during the festival season increased by $100$ times. This could imply a decibel $(dB)$ level rise from

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

Four sources of sound each of sound level $10\,dB$ are sounded together,the resultant intensity level will be ... $dB$