Reflection of Longitudinal Waves

Select the wrong statement about the phenomenon of interference?

The speed of the sound can be determined by using Quincke's. tube. This apparatus is based  on the phenomenon of :

Two loudspeakers $L_1$ and $L_2$ driven by a common oscillator and amplifier are arranged as shown. The frequency of the oscillator is gradually increased from zero and the detector at $D$ records a series of maxima and minima. If the speed of sound is $330 \mathrm{m} {\mathrm{s}}^{-1}$, then the frequency at which the first maximum is observed is

An observer receives waves directly from a source of sound distant $120 \mathrm{m}$ in a big hall. He also receives waves reflected from the mid-point of $25 \mathrm{m}$ high ceiling. The wavelength of sound for constructive interference to take place between two waves, must be

Two speakers connected to the same source of fixed frequency are placed $2 \mathrm{m}$ apart in a box. A sensitive microphone placed at a distance of $4 \mathrm{m}$ from the mid-point along the perpendicular bisector shows maximum response. The box is slowly rotated till the speakers are in line with the microphone. The distance between the mid-point of the speakers and the microphone remains unchanged. Exactly $5$ maximum responses (including the initial and last one) are observed in the microphone in doing this. The wavelength of the sound wave is,

The loudspeakers $L_1$ and $L_2$ driven by a common oscillator and amplifier are set up as shown in the figure. As the frequency of the oscillator increases from zero, the detector at $D$ recorded as a series of maximum and minimum signals. What is the frequency at which the first maximum is observed? (Speed of sound $=330 \mathrm{m} {\mathrm{s}}^{-1}$)

$S_1 \&\mathit{ }{S}_2$ are two coherent sources of sound having no initial phase difference. The velocity of sound is $330 \mathrm{m} {\mathrm{s}}^{-1}$. No minima will be formed on the line passing through $S_2$ and perpendicular to the line joining $S_1 \text{and}\mathit{ }{S}_2$ if the frequency of both the sources is

In Quincke's tube, a detector detects minimum intensity.One of the tube is then displaced by 5cm, during this displacement detector detects maximum intensity for 10 times and then a minimum intensity when the displacement is complete. What is the wavelength of sound?

Which of the following is compound?

Statement-1: Two sound waves of equal intensity I produced beats. The maximum intensity of sound produced in beats is 4I.

Statement-2: If two waves of amplitudes ${\mathrm{a}}_1$ and ${\mathrm{a}}_2$ superpose, the maximum amplitude of the resultant wave $={\mathrm{a}}_1+{\mathrm{a}}_2$ .

$2$ loudspeakers are emitting sound waves of wavelength $\mathrm{\lambda }$ with an initial phase difference of $\frac{\mathrm{\pi }}{2}$. At what minimum distance from $\mathrm{O}$ on line $\mathrm{AB}$ will one hear maxima?

Three sources of equal intensities with frequencies $400, 401$ and $402$ vibrations per second are sounded together. The number of beats per second is

Choose the correct statement

The two loudspeakers in the drawing are producing identical sound waves. The waves spread out and overlap at the point P. This situation is analogous to Young's double-slit experiment, except that sound waves are being used. What is the difference $l_2-l_1$ in the two path lengths, if point P is at the third sound intensity minimum from the central sound intensity maximum? Express this difference in terms of the wavelength $\lambda$ of the sound.

In Quincke's tube a detector detects minimum intensity. Now one of the tube is displaced by 5 cm. During displacement detector detects maximum intensity 10 times, then finally a minimum intensity (when displacement is complete). The wavelength of sound is :

A person $\mathrm{P}$ standing at a distance of $6 \mathrm{m}$ from a source $\mathrm{S}$ of sound receives sound wave in two ways, one directly from the source and the other after reflection from a rigid boundary as shown in the diagram. The maximum wavelength for which, the person will receive maximum sound intensity, is