Which of the following is not a mechanical wave?

The S.I. unit of wavelength is:

Which of the following is correct for speed of sound?

Which of the property of waves does not change from one medium to another medium?

The sound waves are:

At $0{}^{\circ }C0\backslash ,^\backslash circ\; C$ the speed of sound in air is _____.

To hear a distinct echo, the time interval between the original sound and the reflected one must be at least.

At $22{}^{\circ }C22\backslash ,^\backslash circ\; C$ the speed of sound in air is ____.

Which of the following audible range of sound for human being?

The full form of SONAR is:

The sound waves can’t travel in:

The frequency of a source of sound is 10 Hz. How many times does it vibrate in one minute?

The Infrasonic waves have frequency:

Which of the following wave property determine loudness?

A part of longitudinal wave, in which particle of medium are farther crowded than the normal particles is called____.