At what temperature velocity of sound is double than that of at 0°C 

The phase difference between two points separated by 1m in a wave of frequency 120 Hz is 90°. The wave velocity is :

If velocity of sound in a gas is 360 m/s and the distance between a compression and the nearest rarefaction is 1m, then the frequency of sound is 

How many degrees of freedom the gas molecules have if, under STP, the gas density $\rho =1.3 kg/m^3$ and the velocity of sound propagation in it is 330 m$s^{-1}$?

Equation of the wave is given by y = 0.4 sin(314t - 3.14x), where x and y are in meter and t is in second. The speed of the wave is :

A plane progressive wave cannot be represented by

The phase difference between the prongs of a tuning fork is :

The isothermal elasticity of a medium is ${\mathrm{E}}_{\mathrm{i}}$ and the adiabatic elasticity in ${\mathrm{E}}_{\mathrm{a}}$. The velocity of sound in the medium is proportional to

When a wave is reflected from a denser medium the change in phase is :

In a stationary wave along a string, the strain is :

A source of sound moves away with the velocity of sound from a stationary observer. Then the frequency of the sound heard by the observer:

The longitudinal waves can travel :

The equation of a wave pulse travelling along x-axis is given by $y=\frac{30}{2+{\left(x-20t\right)}^2}$, x and y are in meters and t is in seconds. The amplitude of the wave pulse is 

The equation of a standing wave in a string is $\mathrm{y}=\left(200\mathrm{m}\right)\sin \frac{2\mathrm{\pi }}{50}\mathrm{xcos}\frac{2\mathrm{\pi }}{0.01}\mathrm{t}$ where x is in meters and t is in seconds. At the position of antinode,how many times does the distance of a string particle become 200 m from its mean position in one second?

Eleven tuning forks are arranged in increasing order of frequency in such a way that anytwo consecutive tuning forks produce 4 beats per second. The highest frequency is twice that of the lowest. The highest and the lowest frequencies (in Hz) are, respectively:

Consecutive frequencies emitted from an organ pipe are 75Hz, 125Hz, 175Hz. The frequency of the tenth overtone will be:

The sound intensity level at a point 10 m away from a point source is 20dB, then the sound level at a distance 1m from the same source would be

In the phenomenon of interference of sound by two coherent sources if difference of intensity at maxima to intensity at minima is 20dB, then the ratio of intensities of the two sources is

When a sound wave travels from one medium to another, the quantity that remains unchanged is :

If a sound source of frequency n approaches an observer with velocity v/4 and the observer approaches the source with velocity v/5, then the apparent frequency heard will be-

If the density of oxygen is 16 times that of hydrogen, what will be the ratio of their corresponding velocities of sound waves :

The equation of plane progressive wave motion is y=a sin 2$\mathrm{\pi }/\mathrm{\lambda }$(vt-x). Velocity of particle is

The third overtone of a closed pipe is observed to be in unison with the second overtone of an open pipe. The ratio of the lengths of the pipes is

A person speaking normally produces a sound of intensity 40 dB at a distance of 1 m. If threshold intensity fo r reasonable audibility is 20 dB, the maximum distance at which he can be heared clearly is:

The two nearest harmonics of a tube close at one end and open at the other end are 220Hz and 260Hz. What is the fundamental frequency of the system?

Two cars moving in opposite directions approach each other with speed of 22m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340m/s]

The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe L metre long. The length of the open pipe will be

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of $15{\mathrm{ms}}^{-1}$. Then, the frequency of sound that the observerhears in the echo reflected from the cliff will be:
(Take, velocity of sound in air=$330 {\mathrm{ms}}^{-1}$)

An air column, closed at one end and open at the other, resonates with a running fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tunning fork is

A uniform rope of length L and mass m₁ hangs vertically from a rigid support. A block of mass m₂ is attached to the free end of the ropes. A transverse pulse of wavelength λ₁ is produced at the lower end of the rope. The wavelength of the pulse when it reaches the top of the rope is λ₂. The ratio λ₂/λ₁ is-