Two sound waves of slightly different frequencies have an amplitude ratio of $11/9$. What is the difference in sound levels (in decibels) between the maximum and minimum intensities heard at a point?

The intensity of a sound appears to an observer to be periodic. Which of the following can be the cause of it?

Two sources of sound are emitting progressive waves $y_1 = 4 \sin(710 \pi t)$ and $y_2 = 3 \sin(702 \pi t)$. The sources are placed close to each other. The number of beats heard per second and the intensity ratio between waxing and waning are respectively:

There are three sources of sound of equal intensities with frequencies $101 \, Hz$,$103 \, Hz$,and $106 \, Hz$. What is the beat frequency heard if all are sounded simultaneously (in $, Hz$)?

The frequencies of three tuning forks $A$,$B$,and $C$ are related as $n_{A} > n_{B} > n_{C}$. When the forks $A$ and $B$ are sounded together,the number of beats produced per second is $n_1$. When forks $A$ and $C$ are sounded together,the number of beats produced per second is $n_2$. How many beats are produced per second when forks $B$ and $C$ are sounded together?

$A$ tuning fork of known frequency $256\,Hz$ produces $5$ beats per second with the vibrating string of a guitar. The beat frequency decreases to $2$ beats per second when the tension in the guitar string is slightly increased. The frequency of the guitar string before increasing the tension was ..... $Hz$.