When we say sound travels in a medium

Complete the following sentence : When sound travels in a medium, the particles of medium .............. but the disturbance ………………….. .

Choose the correct word/words to complete the following sentence : When sound travels in a medium ...... (the particles of the medium, the source, the disturbance, the medium) travels in form of a wave.

Explain how sound travels in liquids medium.

Name the two kinds of waves in form of which sound travels in a medium.

Why do we say that sound waves are mechinal in character?

Sound waves of wavelength travelling in a medium with a speed of vm/s enter into the medium where its speed is 2vm/s, wavelength of sound waves in the second medium is?