The velocity of sound in a gas is measured to be 340 m/s. If the density of the gas is doubled while the pressure remains constant, what will be the new velocity of sound?

A sound absorber the sound level by $20\,\,dB$. The intensity decreases by a factor of

The transverse displacement of string fixed at both ends is given by $y = 0.06\,\sin \left( {\frac{{2\pi x}}{3}} \right)\cos \left( {120\,\pi t} \right)$, where x and y are in metre and t is in second. The length of the string is 1.5m and its mass is $3 imes {10^{ - 2}}\,\,kg$ . The tension in the string is equal to

Out of following incorrect statement is

A bomb explodes on the moon. How long will it take for the sound to reach the earth?

The wavelength of ultrasonic waves in air is of the order of

Two sound waves (expressed in $CGS$ units) given by ${y_1} = 0.3\,\,\sin \frac{{2\pi }}{\lambda }\left( {vt - x} \right)$ and ${y_2} = 0.4\sin \frac{{2\pi }}{\lambda }\left( {vt - x + heta } \right)$ interfere. The resultant amplitude at a place where phase difference is $\pi /2$ will be

Two monochromatic coherent light beams A and B have intensities $I$ and $\frac{I}{4}$ respectively. If these waves are superposed, the maximum and minimum intensities will be

When two sinusoidal waves moving at right angles to each other superimpose, they produce

On the superposition of two harmonic oscillations represented by ${X_1} = a\sin \left( {\omega t + {\phi _1}} \right)$ and ${X_2} = a\sin \left( {\omega t + {\phi _2}} \right)$a resulting oscillation with the same time period and same amplitude is obtained. The value of ${\phi _1} - {\phi _2}$ is

A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected with