An organ pipe $P_1$, closed at one end vibrating in its first harmonic and another pipe $P_2$, open at both ends vibrating in its third harmonic, are in resonance with a given tuning fork, The ratio of the lengths of $P_1$ and $P_2$ is
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A bus driving along at $39.6 \,km / h$ is approaching a person who is standing at the bus stop, while honking repeatedly at an interval of $30 \,s$. If the speed of sound is $330 \,ms ^{-1}$, at what interval will the person hear the horn?
The given diagram shows three light pieces of paper placed on a wire that is stretched over two supports, $Q$ and $R$ , a distance $4x$ apart. When the wire is made to vibrate at a particular frequency, all the pieces of paper, except the middle one, fall off the wire. Which of the following could be the wavelength of the vibration?
A tuning fork gives $4$ beats with $50\, cm$ length of a sonometer wire if the length of the wire is shortened by $1\, cm$. the no. of beats still the same. The frequency of the fork is -............. $\mathrm{Hz}$
The figure represents the instantaneous picture of a longitudinal harmonic wave travelling along the negative $x$-axis. Identify the correct statement $(s)$ related to the movement of the points shown in the figure. The stationary points are
The driver of a bus approaching a big wall notices that the frequency of his bus's horn changes from $420\, Hz$ to $490\, Hz ,$ when he hears it after it gets reflected from the wall. Find the speed of the bus (in $kmh^{-1}$) if speed of the sound is $330\, ms ^{-1}$.
Sound waves travel at $350\,\, m/s$ through a warm air and at $3500\,\, m/s$ through brass. The wavelength of a $700\,\, Hz$ acoustic wave as it enters brass from warm air