Sound waves are similar to the waves generated in a pipe filled with air by moving the piston attached to the pipe up and down. This option correctly compares sound waves to a specific type of mechanical wave known as a longitudinal wave.

Option 1, comparing sound waves to laser light passing through air, is incorrect. Sound waves are classified as mechanical waves, which require a medium (such as air, water, or solids) to travel through, while light waves (including laser light) are classified as electromagnetic waves that do not require a medium.

Option 2, comparing sound waves to waves generated in a stretched wire by hitting or plucking the wire, is incorrect. This option refers to transverse waves, where the motion of the wave is perpendicular to the direction of the wave`s travel. Sound waves, on the other hand, are longitudinal waves, where the motion of the wave is parallel to the direction of the wave`s travel.

Option 4, comparing sound waves to waves generated by mobile phone towers, is unrelated. Mobile phone towers transmit electromagnetic waves to carry signals, which are different from the mechanical sound waves we`re considering.

In summary, option 3 is the correct answer as it accurately represents the nature of sound waves as similar to the waves generated in a pipe filled