If two interfering waves have intensities in the ratio $9: 1$, then the ratio of maximum to minimum amplitude is

The number of beats produced per second by two tuning forks when sounded together is $4$. If one of them has a frequency of $250 \mathrm{Hz}$, the frequency of other cannot be more than

Two tuning forks of frequencies $256 \mathrm{Hz} \text{and }258 \mathrm{Hz}$ are sounded together. The time interval between two consecutive maxima heard by an observer is

Two tuning forks have frequencies $380 \mathrm{Hz}\text{ and} 384 \mathrm{Hz}$, respectively. When they are sounded together, they produce maximum sound. How long will it take to hear the minimum sound?

A set of $56$ tuning forks is arranged in series of increasing frequencies. If each fork gives $4$beats with preceding one and the frequency of the last is twice that of first, then frequency of the first fork is

Each of a given set of $32$ tuning forks arranged in a series of increasing frequency, gives $6$ beats per second with the preceding fork and the last fork is an octave of the first. The frequency of the lowest pitch is

Two vibrating tuning forks produce progressive waves given by $y_1=4\sin 500\pi t$, $y_2=2\sin 506\pi t$ and are held near the ear of a person. Number of beats heard per minute is

Two waves of wavelength $2 \mathrm{m}$ and $2.02 \mathrm{m}$ with the same speed, superimpose to produce $2$ beats per second. The speed of each wave is

Two tuning forks produce $4$ beats per second when sounded together. The frequency of one of them is $200 \mathrm{Hz}$. When the other tuning fork is loaded with a little wax, the beats stop. The frequency of second tuning fork is